Question

For photoelectric emission from certain metal the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

• A. $\sqrt{\frac{h}{2m}}$
• B. $\sqrt{\frac{hv}{m}}$
• C. $\sqrt{\frac{2hv}{m}}$
• D. $2\sqrt{\frac{hv}{m}}$

Answer 1

Answer: (C)

$\sqrt{\frac{2hv}{m}}$

Answer 2

The correct option is (C): $\sqrt{\frac{2hv}{m}}$