A beam of light of wavelength $400\,nm$ and power $1.55\,mW$ is directed at the cathode of a photoelectric cell. If only $10 \%$ of the incident photons effectively produce photoelectron, then find current due to these electrons $...........\mu A$
[given, $hc =1240\,eV - nm , e =1.6 \times 10^{-{ }^{19}\,C }$ )
$5$
$40$
$50$
$114$
Write equation of mass of photon.
A radio transmitter radiates $1 kW$ power at a wavelength $198.6 $ metres. How many photons does it emit per second
The momentum of the photon of wavelength $5000\,\mathring A$ will be
What is photoelectron ?