Question

1- what is light? (100 words answer)

2- define double slit experiment (100 words answer)

3- defineentanglement (100 words answer)

300 words answer for 3 question separate each answer

Answer 1

What is light?

In physical terms, light is just photons which are packets of energy which is massless and travels at great speed (3x10⁸ m/s) whose absorption, reflection, transmitance makes this world colourful and beautiful. Light is a part of the electromagnetic spectrum commonly known as Visible light whose wavelength range is from 400 to 700 nm, in which oscillating electric and magnetic fields remain perpendicular to each other and to the direction of propagation of wave. Light has both particle and wave nature as shown by various phenomenon like black body radiation, photoelectric effect, inteference, diffraction, compton scattering etc. Light is a transverse, non-mechanical wave that can travel in both medium and vacuum.

Define Double slit Experiment

This is the experiment done by scientist Thomas Young which is considered to be a pioneer in determining the wave nature of light in the early 1800s during which the particle nature of light was prominent and the new theory was far from acceptance. In this experiment, the light is allowed light from a source is allowed to pass through the two slits made in a metal sheet and it produces patterns on the screen placed at the end. Since light has a wave nature the waves pass through these slits and undergo constructive ( crest- crest or trough- trough recombining) inteference or destructive inteference ( crest-trough) and leaves a bright and dark bands on the screen placed at the end. This pattern formed on the screen is called the inteference pattern.

Entanglement

Quantum Entanglement a quantum physical phenomenon in which the measurenment or alteration made on one system affects the other. It is that they are connected to each other even when they are seperated by a very large distance without violating the law of the speed of light as there exists no motion between them. The main classical example of this is the EPR paradox. It is widely used in quantum computing, quantum teleportation etc.