Question

What do you mean by quantisation of energy?

Answer 1

Hello!

Here is your answer!
==========================================================
The quantisation of electric charge is the charge carried by the electrons and it has the magnitude of e=1/6×10^-19c

In nature the electric charge of any system is always an integral multiple of least amount of charge.This means that the quantity can take any one of the discrete set of values.The charge q=ne. where n is the integer.
==========================================================

Hope it helps!

Answer 2

Rather than continuous waves, light was coming in packets of energy which can be defined with its frequency and planck constant 'h' as we mentioned earlier and said 'so, the energy is quantized'. In the atomic world, energies are also quantized. This means it can have only certain values.