Home
Class 12
PHYSICS
Monochromatic light of wavelength 632.8 ...

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
How many photons per second, on the average, arrive at a target irradiated by this beam? (Assume the beam to have uniform cross-section which is less than the taget area).

Promotional Banner

Topper's Solved these Questions

  • UNIT TEST -07

    MODERN PUBLICATION|Exercise EXERCISE|154 Videos

  • UNIT TEST -06

    MODERN PUBLICATION|Exercise EXERCISE|461 Videos

  • UNIT TEST-05

    MODERN PUBLICATION|Exercise EXERCISE|69 Videos

Similar Questions

Explore conceptually related problems

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. Find the energy and momentum of each photon in the light beams.

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?

The energy flux of sunlight reaching the surface of the earth is 1.388 xx 10^3 W/m^2 . How many photons per square metre are incident on the Earth per second? Assume that the photons in the sunlight have an average wavelength of 550 nm.

MODERN PUBLICATION-UNIT TEST -07-EXERCISE
  1. Monochromatic light of wavelength 632.8 nm is produced by a helium-neo...

    Text Solution

    |

  2. The photon of frequency v has a momntum associated with it .If c is th...

    Text Solution

    |

  3. The time taken by a photoelectron to come out after the photon strikes...

    Text Solution

    |

  4. Work function of a metl surface is 4.2 eV. The maximum wavelength whic...

    Text Solution

    |

  5. Sodium and copper have work functions 2.3 eV and 4.5 eV, respectively....

    Text Solution

    |

  6. A photocell is illuminated by a small bright source placed 1 m away .w...

    Text Solution

    |

  7. According to Einstein's photoelectric equation, the graph between kine...

    Text Solution

    |

  8. The surface of a metal is illuminted with the light of 400 nm.the kine...

    Text Solution

    |

  9. The threshold freuency for a metallic surface corresponds to an energy...

    Text Solution

    |

  10. This question has statement - 1 and statement - 2 of the four choice g...

    Text Solution

    |

  11. Two identical photocathodes receive the light of frequencies f1 and f2...

    Text Solution

    |

  12. The anode vollage of a photocell is kept fixed . The wavelength lambda...

    Text Solution

    |

  13. The de-Broglie wavelength of a tennis ball of mass 60 g moving wiht a ...

    Text Solution

    |

  14. If the kinetic energy of a free electron doubles,its de-Broglie wavele...

    Text Solution

    |

  15. A radiation of energy E falls normally on a perfecly reflecting surfac...

    Text Solution

    |

  16. Direction:Answer the MCQ no.15 to 17 on the basis of the folowing para...

    Text Solution

    |

  17. Wave property of electron implies that they will show diffraction effe...

    Text Solution

    |

  18. Wave property of electron implies that they will show diffraction effe...

    Text Solution

    |

  19. Wavelength of the radiation of freuquency 100 Hz is :

    Text Solution

    |

  20. Planck's constant has the dimetnsion of

    Text Solution

    |

  21. The value of Planck's constant is

    Text Solution

    |