The threshold frequency for a certain metal is ' $v_0$ '. When a certain radiation of frequency $2 v_0$ is…
The threshold frequency for a certain metal is ' $v_0$ '. When a certain radiation of frequency $2 v_0$ is incident on this metal surface, maximum velocity of the photo electrons emitted is $2 \times 10^6 \mathrm{~ms}^{-1}$. If radiation of frequency $3 v_0$ is incident on the same metal surface, the maximum velocity of the photo electrons emitted is ____