Which of the following statements are correct?

A. In a photon-particle collision number of photons are conserved.
B. The photoelectric current is directly proportional to the intensity of incident light.
C. The photoelectric emission is an instantaneous process.
D. Maximum kinetic energy of photoelectrons depend on the intensity of incident radiation.
E. The threshold frequency is different for different metals.

Choose the correct answer from the options given below:

B, C and E only

The correct answer is Option (1) - B, C and E only

B. Yes, the photoelectric current is directly proportional to the incident light intensity because as intensity of incident light increases it supply more and more energy to electrons to get away from the metal thereby increasing current.

C. Yes, the photoelectric emission is an instantaneous process as the collision between photon, free nucleus and nucleus is very short ($∼10^{-9}$ seconds).

E. Yes, the threshold frequency is different for different metals as it depends upon properties of metals.