Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident…
Light of frequency two times the threshold frequency is incident on photosensitive material. If the incident frequency is made $\left(\frac{1}{3}\right)^{\mathrm{rd}}$ and intensity is doubled, then the photoelectric current will
increase
decrease
be zero
be halved
Solution
Initial frequency $v=2 v_0$
Final frequency $v^{\prime}=\frac{2 v_0}{3}$
$v^{\prime}$ is less than the threshold frequency $v_0$
Hence no photoelectrons will be emitted, and photoelectric current will be zero.