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Does Time Exist?

WHAT IS TIME ? Einstein  had once said, "Time is just an illusion".  Perhaps it is true that time really does not exist for the universe. After all, we humans are the ones who made it up. THE HISTORY OF TIME A long time ago(sometime before the 1500 B.C.), the sundial was invented in ancient Egypt and the measurement of time began. But back then, time was not measured in the same way as it is measured in the present. The concept of minutes, seconds, and hours didn't exist at that time.  In the past, the unit of time was the period of daylight I had recently read somewhere that maybe time was invented by clock companies to sell more clocks. Are clocks all that time is associated with?  Is there nothing else about time other than minute, second, and hour hands? Of course there is. So let us start expanding our knowledge on time. We have all obviously known since our childhood what time means. But what would you say if  I ask you to explain it to me? How would you p...
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Refraction of Light

You must have heard of reflection of light. It's when a ray of light bounces back from a surface.  When a light ray hits a mirror, it bounces back with the same angle as the angle with which it hit the mirror. The angle of incidence is always equal to the angle of reflection But what if instead of a mirror, there is a transparent surface? In such cases, the light ray goes through the surface, and undergoes refraction.  What is refraction? Refraction is the bending of light when it goes from one medium to another. This happens because the speed of light changes across two different media. When a ray of light is perpendicular to the normal, it travels to the other medium without bending. The ray of light only bends when it goes obliquely from one medium to another. This bending of light depends on the medium through which light is travelling. Optical Density • Rarer medium:  The medium through which the speed of light is more is an optically rarer medium. • Denser medium: The medium...

Electricity

We use electricity everywhere.  When it gets dark, you turn the lights on, which run on electricity. You make your food in your microwave oven, which runs on electricity. You watch your favourite shows on your television, which runs on electricity as well. In fact, the very device you are using right now to read this blog requires electricity to function. Electricity is one of the most important inventions, and is very essential in today's world. BUT WHAT IS ELECTRICITY? Electricity is the set of physical phenomena related to the motion of matter that has a property of electric charge.  For example, when electrons flow in a circuit, they produce electricity/electric current. TYPES OF ELECTRICITY There are two types of electricity: • Static electricity :  It occurs when there is an imbalance between negative and positive charges in an object. This can be done by rubbing materials together which leads to the transfer of negative charge(electrons).  For example, wh...

Speed, Distance and Time | How are they related?

Speed, distance and time are very essential concepts when one starts to learn about physics. Talking about one of them naturally brings up the other two as well, since they are linked with each other. Let's find out how, and learn about them!  SPEED Speed is a measure of how fast something is moving. It is how quickly an object is changing it's position, and so, it is a scalar quantity .  • The speed of an object is said to be more when it is travelling faster and covers more distance in a certain time. • The speed of the object is said to be less when it is travelling slower and covers lesser distance in the same time. SI unit of speed : • m/s (metres  per second) • Commonly used : Km/h (Kilometres per hour) • m/h (miles per hour) How to calculate speed : speed = distance/ time DISTANCE The distance between two objects is a measure how far away the objects are from each other. It is the physical length between two objects. • The distance between two objects is...

THE MYSTERIOUS OCTAHEDRON

Today's post is more related to mathematics, as you can tell from the title. I'll be telling you about the amazing solid shape, the octahedron. WHAT YOU WILL LEARN TODAY : We will have found-  -->The derivation of the formula for the volume of the octahedron. -->The ratio of the volume of an octahedron when placed inside a cube with its vertices touching the centers of the faces of the cube and the volume of the cube.  So! Let's begin! You will have to understand platonic solids first. PLATONIC SOLIDS: Platonic solids are five geometric solids that have congruent and regular sides that meet at three-dimensional angles.  Plato used them to explain the structure of the universe. Hence, the name 'Platonic'. There are five Platonic solids:  the tetrahedron with four faces,  the cube with six faces,  the octahedron with eight faces,  the dodecahedron with twelve faces,  and the icosahedron with twenty faces.   They are used in many fields, including biomedical rese...

The Speed of Light | Why Does it Matter?

HOW FAST DOES LIGHT TRAVEL? If you could travel at the speed of light, you could go around the Earth 7.5 times in one second. This is because the speed of light is as fast as 300,000 kilometres per second or 300,000,000 metres per second . The speed of light in a vacuum is 186,282 miles per second or 299,792 kilometers per second , and in theory nothing can travel faster than light.  This is the cosmic speed limit, and the constant that stands for the speed of light in vacuum is known as 'c' or 'celeritas'. BUT CAN ANYTHING ELSE TRAVEL AT THE SPEED OF LIGHT? Quarks, leptons, neutrinos, and even dark matter all have masses as a property inherent to them. Objects made out of these particles, such as protons, atoms, and even human beings all have masses as well. As a result, they can approach, but never reach the speed of light in a vacuum. No matter how much energy you put into them, the speed of light, even in a vacuum, will forever be unattainable, and nothing...

General Relativity Explained

Have you ever heard about General relativity?  General relativity is a remarkable theory published by the well known physicist Albert Einstein. Let us know more about general relativity. General relativity is the geometric theory of gravitation published by Albert Einstein. Albert Einstein published this theory in 1915. It is the current description of gravitation in modern physics. General relativity generalizes special relativity and Newton's law of universal gravitation , and gives a unified description of gravity as a geometric property of space and time, or space-time . THE CURVATURE OF SPACE-TIME AND THE EINSTEIN FIELD EQUATIONS The  curvature of space-time is directly related to the energy and momentum of whatever matter and radiation are present. The relation is specified by the Einstein field equations. That is a system of partial differential equations. The Einstein field equations comprise a set of 10 equations in Albert Einstein's general theory of ...