A quantum of light having energy E has wavelength equal to `7200 A^(@)`. The frequency of light which corresponds to energy equal to 3E, is

Options

A. `1.25 xx 10^(14)s^(-1)`
B. `1.25 xx 10^(15)s^(-1)`
C. `1.25 xx 10^(13)s^(-1)`
D. `1.25 xx 10^(14)s^(-1)`

Answer

B

Explanation

`v_(1) = (c)/(lambda_(1)), v_(2) = (c)/(lambda_(2)),(E_(1))/(E_(2)) = (v_(1))/(v_(2))`