A metal is irradiated with a radiation of wavelength 300 nm. Then photo electrons found to have velocity of `3.7 xx 10^5 `m/s. When a graph is drawn between K.E of photo electrons and frequency of radiation a straight line is obtained cutting X-axis.
What is the K.E. of photo electrons

Options

A. `6.23xx10^(-20)` J
B. `6.25 xx 10^(-22)` J
C. `6.625xx10^(-18)` J
D. `6.625 xx10^(-19)` J

Answer

A

Explanation

K.E `=1/2 mv^2 = 6.23xx10^(-20) J`