Question

In photoelectric effect, the electrons are ejected from metals if the incident light has a certain minimum

• A. wavelength
• B. frequency
• C. amplitude
• D. angle of incidence

Answer 1

Answer: (B)

In photoelectric effect for a given photosensitive material, there exists a certain minimum cut-off frequency, called the threshold frequency, below which no emission of photoelectrons takes place no matter how intense the light is.