Question

Photoelectric emission occurs only when the incident light has more than a certain minimum :

• A. Power
• B. Wavelength
• C. Intensity
• D. Frequency

Answer 1

Answer: (D)

Frequency

Answer 2

: According to Einstein’s photoelectric equation

$K _ { \max } = h v - h v _ { 0 }$

Since is positive the photoelectric emission occurs only if

The photoelectric emission occurs only when the incident light has more than a certain minimum frequency. This minimum frequency is called threshold frequency