Physical Chemistry Which of the following statements is true? A) A diffraction p

ID: 926647 • Letter: P

Question

Physical Chemistry

Which of the following statements is true?

A) A diffraction pattern generated by an electron gun is formed by electrons interfering with one another.

B) The inability of classical theory to explain the spectral density distribution of a blackbody was called the ultraviolet catastrophe.

C) There is no upper limit to the photon energy that can be observed in the emission spectrum of the hydrogen atom.

D) Einstein explained the photoelectric effect by postulating that the energy of light depends on its frequency.

B and D A and B B and C A and D

answer : A and D

Explanation :

diffreaction is nothing but interference of wave functions of electrons . so A is correct

photo electric effect Einstein used quantum concept . so he included frequency from E = hv formula. so D correct