Question

The maximum kinetic energy of photoelectrons is directly proportional to ______ of the incident radiation. The missing word can be:

• A. intensity
• B. wavelength
• C. wave number
• D. frequency

Answer 1

Answer: (C), (D)

wave number
frequency

The maximum kinetic energy of photoelectrons is directly proportional to wave number or frequency of the incident radiation. Also, the maximum kinetic energy of photoelectrons is directly proportional to wavelength
The energy of incident radiation
$E=h\nu =hc\overline{\nu }=\frac{hc}{\lambda }$
The maximum kinetic energy of photoelectrons $=E-w$, where w is the work function of the metal.