Home
Class 12
PHYSICS
A photo sensitive surface is receiving ...

A photo sensitive surface is receiving light of wavelength 6000 Å at the rate of `10^(-7)`J/s . The number of photons striking the surface per second is approximately equal to

A

`1.5xx10^(11)`

B

`3xx10^(11)`

C

`4xx10^(11)`

D

`6xx10^(11)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E=nhv=(nhc)/(lambda)`
`:. N=(E lambda)/(hc) :. n/t = (E/t)xx lambda/(hc)`
`:. n/t = 3xx10^(11)`
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS AND PHOTONS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 17|15 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 16|30 Videos

  • ELECTROSTATICS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|20 Videos

Similar Questions

Explore conceptually related problems

The photosensitive surface is receiving the light of wavelength 5000Å at the rate of 10^(-8)"J s"^(-1) . The number of photons received per second is (h=6.62xx10^(-34)Js, c=3xx10^(8)ms^(-1))

A 100 W point source emits monochromatic light of wavelength 6000 A Calculate the total number of photons emitted by the source per second.

A radio transmitter operates at a frequency of 300 KHz and a power of 10 KW. The number of photons emitted per second is approximately equal to

If mean wavelength of light radiated by 100 W lamp is 5000 Å , then number of photons radiated per second are

A 20 W lamp rated 10% emits light of wavelength y. Calculate the number of photons emitted by the lamp per second.

The number of photo - electrons emitted per second from a metal surface increases when

A monochromatic light source of frequency 6xx10^(14)Hz is emitting energy at the rate 2xx10^(-3)J//s . Calculate the number of photons emitted per seconds by source.

MARVEL PUBLICATION-ELECTRONS AND PHOTONS -TEST YOUR GRASP - 17
  1. A photo sensitive surface is receiving light of wavelength 6000 Å at ...

    Text Solution

    |

  2. The energy of a photon of wavelength 4000 Å is (use h=6.66xx10^(-34...

    Text Solution

    |

  3. In a photoelectric experiment, the reciprocal of the slope of the st...

    Text Solution

    |

  4. The momentum of a photon of an electromagnetic radiation is 3.3xx10^(-...

    Text Solution

    |

  5. If the threshold frequency for photoemission on a metal corresponds t...

    Text Solution

    |

  6. Photons of energy 5.5 eV are incident on a metal surface. If the stopp...

    Text Solution

    |

  7. When light of energy 2.5 eV falls on a metal surface, the maximum K.E....

    Text Solution

    |

  8. The threshold energy of a surface is 2 eV. When irradiated with some r...

    Text Solution

    |

  9. Sodium and copper have work functions of 2.3 eV and 4.5 eV. The ratio ...

    Text Solution

    |

  10. The surface of a metal is illuminated with light of wavelength 400 nm....

    Text Solution

    |

  11. The current in a photocell can be just reduced to zero by a potential ...

    Text Solution

    |

  12. A lamp is placed at a distance of 8 cm from a photocell and the microa...

    Text Solution

    |

  13. The cathode of a photoelectric cell is changed such that the work func...

    Text Solution

    |

  14. The wavelength of the photons are 4500 Å and 6000 Å. The ratio of thei...

    Text Solution

    |

  15. An AIR station is broadcasting the waves of wavelength 300 metres. If ...

    Text Solution

    |

  16. For a photosensitive metal surface the graph of the stopping potential...

    Text Solution

    |