Ultraviolet light of wavelength $300 \ nm$ and intensity $1.0 \ watt/m^2$ falls on the surface of a photosensitive material. If $1\%$ of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of $1.0\ cm^2$ of the surface is nearly
Ultraviolet light of wavelength $300 \ nm$ and intensity $1.0 \ watt/m^2$ falls on the surface of a photosensitive material. If $1\%$ of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of $1.0\ cm^2$ of the surface is nearly
- A
$9.61 \times {10^{14}}per\;\sec $
- B
$4.12 \times {10^{13}}per\;\sec $
- C
$1.51 \times {10^{12}}per\;\sec $
- D
$2.13 \times {10^{11}}per\;\sec $
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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
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- [AIIMS 2008]
If $5\%$ of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per sec by a $100$ $watt$ lamp ? Assume wavelength of visible light as $5.6\times10^{-5}\, cm$.
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If $c$ is the velocity of light in free space, the correct statements about photon among the following are:
$A$. The energy of a photon is $E=h v$.
$B$. The velocity of a photon is $c$.
$C$. The momentum of a photon, $p=\frac{h v}{c}$.
$D$. In a photon-electron collision, both total energy and total momentum are conserved.
$E$. Photon possesses positive charge.
Choose the correct answer from the options given below:
If $c$ is the velocity of light in free space, the correct statements about photon among the following are:
$A$. The energy of a photon is $E=h v$.
$B$. The velocity of a photon is $c$.
$C$. The momentum of a photon, $p=\frac{h v}{c}$.
$D$. In a photon-electron collision, both total energy and total momentum are conserved.
$E$. Photon possesses positive charge.
Choose the correct answer from the options given below:
- [NEET 2024]
When an inert gas is filled in the place vacuum in a photo cell, then
When an inert gas is filled in the place vacuum in a photo cell, then