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(A) The photoelectric effect revealed an unusual fact: when light interacts with matter,it behaves as if it is composed of discrete quanta. The energy

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Yes

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(A) The photoelectric effect revealed an unusual fact: when light interacts with matter,it behaves as if it is composed of discrete quanta. The energy of each quantum is $E = h
u$.There are two primary pieces of evidence that light can be associated with a particle:$(i)$ Einstein derived an important result that a quantum of light possesses a momentum of $p = \frac{h
u}{c}$,where $h$ is Planck's constant,$
u$ is the frequency of light,and $c$ is the speed of light. Thus,a quantum of light has both energy $h
u$ and momentum $\frac{h
u}{c}$. Consequently,a quantum of light can be associated with a particle,which is called a photon.$(ii)$ Another piece of evidence to associate a light quantum with a particle was provided by the scientist $A.H. Compton$ in $1924$. He conducted experiments on the scattering of $X$-rays by electrons (Compton scattering).In $1921$,Einstein was awarded the Nobel Prize for theoretical physics and his explanation of the photoelectric effect.In $1923$,Millikan was awarded the Nobel Prize for his work on the elementary charge of electrons and his experimental verification of the photoelectric effect.

Can a quantum of light be associated with a particle?

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