Why light is quantum?

REAL SOLUTION!

ok i am not going to give you the most common answer because it behaves like quantum.

there are certain phenomenon of light like photoelectric effect, Compton effect, absorption and emission of photon by atom. these phenomenon of light which can be observed practically can be only explained if it is considered to be made up of small discrete particles called photon(quantum). therefor it is quantum. hope you get it, if not try going through the topic photoelectric effect, it will surely make you clear!

good luck!

because light comes in packet of quantum.

its is a very tiny particle.

"All of Quantum Mechanics is contained in the 2-Slit Experiment" - Richard Feynman

Apply the Duck Test:

If it looks like a duck

and

It quacks like a duck

and

it flys like a duck

and

it waddles like a duck

and

it swims like a duck

and

it is seen in the company of things you know to be ducks

Then, its a duck

Translation: If it behaves as a quantum, its a quantum.

It's just an observation of how the university works. Energy comes in packets called quanta or photons.

Because light comes in small packets of energy called photons.