For photoelectric emission from certain metal the cutoff frequencyis v. If radiation of frequency 2 v impinges on the metalplate, the maximum possible velocity of the emitted electron will be (m is the electron mass) :

A

2 $$\sqrt{\frac{h \nu}{m}}$$

B

$$\sqrt{\frac{h \nu}{2m}}$$

C

$$\sqrt{\frac{h \nu}{m}}$$

D

$$\sqrt{\frac{2h \nu}{m}}$$