Loading

USE PROMO CODE "DEMO100" TO AVAIL FREE DEMO CLASS
Read what we say in our blog

OUR BLOGS

Gorilla glass
Gorilla glass

Gorilla Glass

 

Scratch resistant and crack resistant glasses are a must when choosing mobile phones these days. And gorilla glass is the most famous and mostly used brand for glasses for phone screens. There are also brands like Dragontrail and Xensation, but are not widely used by mobile phone brands these days.

 

Gorilla glass is a brand of chemically strengthened glass developed and manufactured by Corning. It is manufactured in Harrodsburg in Kentucky, Asan in Korea, and Taiwan. Corning Incorporated is an American multinational technology company that specializes in speciality glass, ceramics, and related materials and technologies including advanced optics, primarily for industrial and scientific applications. The company was named Corning Glass Works until 1989.

 

Gorilla glass is an alkali -aluminosilicate based sheet glass, used primarily for screen covers for phones and tablets, television screens etc. The glass gains its strength, ability to contain flaws and crack resistance by being immersed in a propriety, hot, potassium salt, ion exchange bath.

 

There are almost 9 versions of the glass launched through out the years since 2010.

 

Version

Launched

1

February 2008

2

January 2012

3

January 2013

4

November 2014

5

July 2016

SR+

August 2016

6

July 2018

DX / DX+

July 2018

Victus

July 2020

 

Manufacture

During the manufacturing process, the glass is toughened by ion exchange. The material is immersed in molten alkaline potassium salt at a temperature of approximately 400 C. The smaller sodium ions in the glass are replaced by larger potassium ions from the salt bath. The larger ions occupy more volume and thereby create a surface layer of high residual compressive stress, giving the glass surface increased strength, ability to contain flaws and overall crack resistance.

 

Also Read- GRAVITY (BASIC)

 

Read More

Magnets ( Our earth also has magnetic field)
Magnets ( Our earth also has magnetic field)

                                                                    Magnet

A magnet is a material or object that produces a magnetic field. A magnet exerts a force on similar materials that either pulls the objects toward one another or repels one another.

Materials are classified into different types depending on their effect with magnetism. They are as follows:

  1. Paramagnetic materials are not strongly attracted to a magnet. For example, aluminium, tin, magnesium etc. Their relative permeability is small but positive. Such materials are magnetized only when placed in a very strong magnetic field and act in the direction of the magnetic field.

Paramagnetic materials have individual atomic dipoles oriented in a random fashion as shown in the figure below.

 

                                             A group of birds flying in the sky

Description automatically generated with medium confidence                                                       

The resultant magnetic force in such materials is zero. When a strong external magnetic field is applied, the permanent magnetic dipoles orient them self-parallel to the applied magnetic field and give rise to a positive magnetization. Since, the orientation of the dipoles parallel to the applied magnetic field is not complete, the magnetization is very small.

 

                                      A picture containing diagram

Description automatically generated

  1. Diamagnetic materials are repelled by a magnet such as zinc, mercury, lead, sulphur, copper, silver, wood, etc. Their permeability is slightly less than one. They are slightly magnetized when placed in a very strong magnetic field and act in the direction opposite to that of applied magnetic field. In diamagnetic materials, the two relatively weak magnetic fields caused due to the orbital revolution and axial rotation of electrons around nucleus are in opposite directions and cancel each other. Permanent magnetic dipoles are absent in them, Diamagnetic materials have very little to no applications in electrical engineering.

                                           Diagram

Description automatically generated

 

  1. Ferromagnetic materials are material that are strongly attracted by a magnetic field or magnet. For example, iron, steel, nickel, cobalt etc are ferromagnetic materials. The permeability of these materials is extremely high.  The opposite magnetic effects of electron orbital motion and electron spin do not eliminate each other in an atom of such a material. There is a relatively large contribution from each atom which aids in the establishment of an internal magnetic field, so that when the material is placed in a magnetic field, its value is increased many times the value that was present in the free space before the material was placed there.                                                                                                                                                                                 Diagram

Description automatically generated        

                        

  1. Ferrites are a special type of ferromagnetic material that occupy an intermediate position between ferromagnetic and non -0ferromagnetic materials. The magnetization produced in ferrites is large enough to be of commercial value, but their magnetic saturation is not as high as those of ferromagnetic materials. As in the case of ferromagnetic, ferrites may be soft or hard ferrites.

 

                                           Types of Magnets                                 

Based on properties magnets can be classified into different types. They are mentioned below.

Diagram

Description automatically generated                     Shape

Description automatically generated with medium confidence

 

  1. A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. Permanent magnets are known to retain their magnetic property unless they are necessarily demagnetized using any of the following methods:

 

  • The magnetic properties between the atoms of the magnet weaken when exposed to extreme temperatures.
  • Hammering on the magnets will loosen the magnetic strength.
  • Improperly stroking one magnet with another also reduces the magnetic attraction properties of permanent magnets.
  1. Temporary magnets are defined as magnets such that when the material is placed in a magnetic field it acts as a permanent magnet. Temporary magnets lose their magnetism after the magnetic field is removed. Unlike permanent magnets, temporary magnets do not retain their magnetic property. Therefore, they are called temporary magnets. Some irons, iron alloys, iron nails and paper clips act as a temporary magnet in the presence of a magnetic field.
  2. Electromagnets are the magnets created by winding a wire in several loops around a metal core composed of iron. When this arrangement known as solenoid is placed by the electric field and an electric current is passed through it, the wires energised coil generates the magnetic field which eventually acts as a magnet. The strength of magnetism can be controlled by adjusting or altering the electric current's strength and direction. Besides, the field inside the prepared coil is the highest, and the strength of the field is directly proportional to the number of wire loops and the carried current. When the electric current is stopped, the magnetic field disappears, and so the metal's magnetism property. The material used in the centre of the electromagnet arrangement may also influence the overall electromagnet's power. As a result, electromagnets also are not permanently magnetic.

Also Read- GRAVITY (BASIC)

 

 

Read More

Measuring distance between stars and planets
Measuring distance between stars and planets

Measuring distances in space

Space is very vast, even our solar system is so vast that to explore it with our current technology would take decades and a lot of resources. If we use the normal units to measure the distance between planets and the star, we will have to write thousands and millions of kilometres each time we need it. So, the astronomers defined new sets of units to measure distance of the heavenly bodies. They are all mentioned below.

Lunar Distance (LD)

The instantaneous Earth–Moon distance, or distance to the Moon, is the distance from the centre of Earth to the centre of the Moon. The LD is a unit of measure in astronomy. More technically, it is the semi major axis of the geocentric lunar orbit.

Graphical user interface, text, website

Description automatically generated                             

The lunar distance is approximately 384,400 km. this is roughly 30 times earth’s diameter. The actual distance varies over the course of the orbit of the Moon, from 356,500 km at the perigee to 406,700 km at apogee, resulting in a differential range of 50,200 km.

Lunar distance is commonly used to express the distance to near-Earth object encounters. Lunar semi-major axis is an important astronomical datum; the few millimetres precision of the range measurements determines semi-major axis to a few decimetres; it has implications for testing gravitational theories such as general relativity, and for refining other astronomical values such as Earth mass, Earth radius, and Earth's rotation. The measurement is also useful in characterizing the lunar radius, the mass of the Sun and the distance to the Sun.

Astronomical unit (AU)

It is roughly the distance between earth and the Sun and equal to about 150 million kilometres. The actual distance varies by about 3 percent as earth orbits the sun from a maximum (aphelion) to a minimum (perihelion) and back again once year. The astronomical unit was originally conceived as the average of Earth's aphelion and perihelion; however, since 2012 it has been defined as exactly 149597870700 m.

Text, website

Description automatically generated

 

The astronomical unit is used primarily for measuring distances within the Solar System or around other stars. It is also a fundamental component in the definition of another unit of astronomical length, the parsec.

The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206,000 astronomical units (au), i.e., 30.9 trillion kilometres. Parsec is obtained using parallax and trigonometry and is defined as the distance at which 1 au subtends an angle of one arcsecond.  

Diagram

Description automatically generated                    The nearest star, Proxima Centauri, is about 1.3 parsecs (4.2 light-years) from the Sun. Most of the stars visible to the unaided eye in the night sky are within 500 parsecs of the Sun. The word parsec is a portmanteau of "parallax of one second" and was coined by the British astronomer Herbert Hall Turner in 1913 to make calculations of astronomical distances from only raw observational data easy for astronomers. Partly for this reason, it is the unit preferred in astronomy and astrophysics, though the light-year remains prominent in popular science texts and common usage.

A picture containing graphical user interface

Description automatically generated

           One could fit all the other planets in the solar system between earth and the moon

                          Chart, bubble chart

Description automatically generated            

                                  The distance of various planets from the Sun

Light Year (LY)

The light-year, alternatively spelled lightyear, is a unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometres (9.46×1012 km). As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).Because it includes the word "year", the term light-year is sometimes misinterpreted as a unit of time.

The light-year is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications. The unit most used in professional astronomy is the parsec (symbol: pc, about 3.26 light-years) which derives from astrometry.

Background pattern

Description automatically generated with medium confidence

 

Distances expressed in light-years include those between stars in the same general area, such as those belonging to the same spiral arm or globular cluster. Galaxies themselves span from a few thousand to a few hundred thousand light-years in diameter and are separated from neighbouring galaxies and galaxy clusters by millions of light-years. Distances to objects such as quasars and the Sloan Great Wall run up into the billions of light-years.

             Diagram

Description automatically generated             

                                The distance between star clusters and galaxy

 

Also Read- THE SOLAR SYSTEM

Read More

Facts about the largest planet of our solar system (Jupiter)
Facts about the largest planet of our solar system (Jupiter)

                                    The biggest planet in our solar system

Jupiter is one of the brightest planets in our skies and the largest and most massive planet in the Solar System. It has faint rings, numerous moons, and an unstable surface. Jupiter is considered the giant or the Jovian planet, together with Saturn, Uranus, and Neptune. When ancient astronomers named Jupiter after the Roman ruler of all gods, they had no idea about its enormous size surpassing other planets. Yet, they came up with a very fitting name.

Jupiter's size

With a radius of 69,911 km, Jupiter is the biggest planet in the Solar System. In comparison, the second-biggest Saturn has a radius of 58,232 km (36,184 mi). Jupiter is also the most massive planet — it’s more than twice as massive as all the other planets combined

Jupiter's orbit and rotation

Each planet takes a certain amount of time to complete one orbit around the Sun and one rotation around its axis. As we live on the Earth, we take the local days (24 hours) and years (365.25 days) as a standard. Let's see how different from our planet Jupiter is.

Despite being the largest planet, Jupiter is also the fastest spinning planet in the Solar System; therefore, it has the shortest days. One day on Jupiter takes slightly less than 10 hours — the exact time varies from 9 hours and 56 minutes around the poles to 9 hours and 50 minutes close to the equator. The reason behind this difference is that Jupiter is a gas planet and doesn’t rotate as a solid sphere. Instead, its equator rotates slightly faster than the polar regions, which leads to the distinction in the day length in different areas.

One Jovian year takes 11.8618 Earth years or 4,332.59 Earth days. In comparison, the second-largest planet Saturn has an orbital period of around 29 Earth years and the smallest Mercury revolves around the Sun every 88 Earth days

How many Earths can fit in Jupiter?

It would take more than 1,300 Earths to build a single Jupiter. If the gas giant were the size of a basketball, the Earth would be the size of a grape.

How far is Jupiter from the Sun?

The gas giant is 5.2 AU from the Sun or 778 million km away. In comparison, Mercury, the closest planet to the Sun, is 0.4 AU or roughly 58 million km away from our star. (One astronomical unit (AU) is the distance between the Sun and the Earth.)

How far is Jupiter from the Earth?

The distance between planets is constantly changing because they are moving along their orbits. Jupiter is only 588 million km away when it’s closest to our planet and 968 million km at its farthest.

How long does it take to get to Jupiter?

For a simple flyby, it will take about 550-650 days as it happened with the Voyager spacecraft: Voyager 1 took only 546 days, and Voyager 2 took 688 days. However, if you’re planning to go into Jupiter’s orbit, you’ll need to be going slowly enough when you reach the planet. For example, NASA’s Galileo spacecraft flight duration was 2,242 days before it finally arrived at Jupiter.

What is Jupiter made of?

Jupiter doesn’t have a solid surface; its atmosphere just gets denser the farther down you go, transitioning into a liquid layer surrounding a small core. Simply, it means that the atmosphere of Jupiter makes up almost the entire planet. Jupiter (and its atmosphere) consists of about 90 % hydrogen and 10 % helium — which is very similar to the Sun’s composition.

Jupiter’s formation

Like other planets in the Solar System, Jupiter formed about 4.5 billion years ago, when gravity pulled gas and dust together to create the gas giant. The planet took most of the mass left over after the formation of the Sun and became more than twice the combined material of the other bodies in the Solar System. About 4 billion years ago, Jupiter settled into its current position as the fifth planet from the Sun.

Jupiter's structure

We still don’t know for sure what Jupiter’s core looks like. It might consist of solid materials or be a thick, boiling, dense soup. What we know is that the core is surrounded by a layer of liquid metallic hydrogen that extends out to 90% of the planet’s diameter.

Jupiter's surface

This gas giant doesn’t have the hard surface as we do on the Earth. The planet is mostly swirling gases and liquids. A spacecraft can’t land on it or fly through the planet due to the extreme pressures and temperatures that will crush, melt, and vaporize it.

What is the Great Red spot on Jupiter?

The Great Red Spot is a giant storm about twice as wide as the Earth located in Jupiter’s Southern Hemisphere. It consists of crimson-coloured clouds that spin counter-clockwise at a speed that exceeds any storm’s speed on the Earth.

This storm was first observed in 1878; however, Gian Domenico Cassini in 1665 mentioned “Permanent Storm,” which is believed to be the Great Red Spot. Such a long-lasting storm can be explained by the absence of a solid surface on Jupiter. On the Earth, hurricanes disintegrate when they reach solid ground, but the Red Spot simply doesn’t have land to collide with.

However, the Great Red Spot has been shrinking over the years: from a length of about 40,000 km (24,850 mi) in 1879 to nearly 15,000 km (9,320 mi) in 2021. The reasons behind it are unknown.

Jupiter's moons

Jupiter and its numerous satellites resemble a miniature Solar System and present a scientific interest for astronomers around the world.

How many moons does Jupiter have?

Jupiter has 79 moons: 53 of them are named, and 26 are waiting for an official name. Most of them are small — about 60 satellites are less than 10 km (6.2 mi) in diameter. The number of moons is constantly changing; in 2003, astronomers discovered 23 new moons, then, in 2018, 12 more Jovian moons were found. As of 2021, Jupiter is losing to Saturn on the number of satellites; according to NASA, the ringed planet has 82 moons.

What is Jupiter's 4 largest moons?

Jupiter’s four largest moons are Io, Europa, Ganymede, and Calisto. They’re called the Galilean satellites after their discoverer and are as remarkable as Jupiter itself.

The largest one, Ganymede, is bigger than Mercury and is known as the most gigantic satellite in the Solar System. It even has its own magnetic field! Europa, in its turn, has a very high potential to be habitable — there is evidence of a vast ocean just beneath its icy surface. It’s thought to have twice as much water as the Earth. Io is the most volcanically active body in the Solar System, with hundreds of volcanoes on it.

Calisto, which is about the same size as Mercury (99% of its diameter, to be precise), is the third-largest satellite in our Solar System and may look boring against the background of the other three moons. However, in the 1990s, NASA’s Galileo spacecraft revealed that there might be a salty ocean beneath Calisto’s surface.

Jupiter's rings

The Jovian ring system was the third ring system discovered in the Solar System, after those of Saturn and Uranus. Jupiter’s rings are faint and mostly consist of dust; they’re likely leftovers from meteor bombardment of Jovian moons.

How many rings does Jupiter have?

Jupiter has four rings: the closest to the planet faint halo ring, a relatively bright but very thin main ring, and two wide and thick gossamer rings — the Amalthea and the Thebe. The last two are named after the moons of whose material they consist of.

Are Jupiter's rings visible?

We surely won’t see the Jupiter rings with the naked eye since they’re too faint and tenuous. For ground-based observation, the largest telescopes available are required. Even from space, they’re visible only when viewed from behind Jupiter and are lit by the Sun or directly viewed in the infrared.

Missions to Jupiter

Since 1973, nine spacecraft have visited Jupiter. The most noteworthy ones are:

  1. The first one was NASA’s Pioneer 10 that provided hundreds of Jupiter’s photos and collected some measurements. The Pioneer 11 in 1974 got three times closer to the planet than its predecessor.
  2. In 1979, the famous Voyager spacecraft discovered the Jovian ring system and took thousands of pictures of clouds and storms on the planet. Those pictures also showed that the mysterious Great Red Spot is a gigantic storm. Moreover, Voyager 1 and 2 discovered dozens of volcanoes on Jupiter’s moon Io — the first found active volcanoes on another space object.
  3. NASA’s Galileo probe became the first spacecraft to enter Jupiter’s orbit; it arrived on the planet in 1995. The Galileo mission, among many other things, examined Jupiter’s atmosphere and immense magnetic field and closely studied the Galilean moons. Several years later, in 2000, the Cassini spacecraft that was heading to Saturn took some of the best photos we have of Jupiter.
  4. The second spacecraft ever to enter Jupiter’s orbit is called Juno. It arrived at Jupiter in 2016 and will be exploring the gas giant until September 2025 or the spacecraft's end of life.

Also Read- ASTEROIDS

Read More

Light
Light

                                                       Light

Light is an electromagnetic radiation which is visible by the human eye, within the spectrum of the electromagnetic spectrum. Visible light has wavelength range between 400 to 700 nm (nanometres), between the infrared with larger wavelength and the ultraviolet with shorter wavelength. This wavelength has a frequency range of roughly 430–750 terahertz (THz).