Photo cells are used for the
Photo cells are used for the
- A
Reproduction of pictures from the cinema film
- B
Reproduction of sound from the cinema film
- C
Automatic switching of street light
- D
$(b)$ and $(c)$ both
Similar Questions
Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.
Assertion : Photoelectric saturation current increases with the increase in frequency of incident light.
Reason : Energy of incident photons increases with increase in frequency and as a result photoelectric current increases.
- [AIIMS 2015]
One milliwatt of light of wavelength $4560\ \mathring A $ is incident on a cesium surface of work function $1.9\ eV$. Given that quantum efficiency of photoelectric emission is $0.5\%$. Planck's constant $h = 6.62 \times 10^{-34}\ J-s$, velocity of light $= 3 \times 10^8\ ms^{-1}$, the corresponding photo electric current is
Momentum of a photon of wavelength $\lambda$ is
Momentum of a photon of wavelength $\lambda$ is
- [AIPMT 1993]
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, $hc =1240\,eV - nm , e =1.6 \times 10^{-{ }^{19}\,C }$ )
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, $hc =1240\,eV - nm , e =1.6 \times 10^{-{ }^{19}\,C }$ )
- [AIIMS 2015]
The work function of a photoelectric material is $3.3 eV$. The threshold frequency will be equal to
The work function of a photoelectric material is $3.3 eV$. The threshold frequency will be equal to