Home
Class 11
PHYSICS
Ultraviolet light of wavelength 300nn an...

Ultraviolet light of wavelength 300nn and intensity `1.0Wm^-2` falls on the surface of a photosensitive material. If one per cent of the incident photons produce photoelectrons, then the number of photoelectrons emitted per second from an area of 1.0 `cm^2` of the surface is nearly

A

`9.61 xx10^14 ` Per second

B

`4.12 xx10^13` Per second

C

`1.51 xx10^12` Per second

D

`2.13 xx10^11` Per second

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Evaluation Test|19 Videos

  • ELECTRONS AND PHOTONS

    TARGET PUBLICATION|Exercise Critical thinking|22 Videos

  • COMMUNICATION SYSTEMS

    TARGET PUBLICATION|Exercise Evaluation Test|15 Videos

  • FORCE

    TARGET PUBLICATION|Exercise Evaluation Test|16 Videos

Similar Questions

Explore conceptually related problems

Light of wavelength 5000 Å and intensity of 3.96 xx 10^(-3) watt//cm^(2) is incident on the surface of photo metal . If 1% of the incident photons only emit photo electrons , then the number of electrons emitted per unit area per second from the surface will be

Ultraviolet light of wavelength 350 nm and intensity 1 W//m^2 is directed at a potassium surface having work function 2.2 eV (ii) if 0.5 percent of the incident photons produce photoelectric effect, how many photoelectrons per second are emitted from the potassium surface that has an area 1 cm^2 . E_("kmax") =1.3 eV, n= 8.8 xx 10^(11)("photo electron")/("second") or r =(Nhv)/t =nhv

Ultraviolet light of wavelength 66.26 nm and intensity 2 W//m^(2) falls on potassium surface by which photoelectrons are ejected out. If only 0.1% of the incident photons produce photoelectrons, and surface area of metal surface is 4 m^(2) , how many electrons are emitted per second?

1.5 mW of 400 nm light is directed at a photoelectric cell. If 0.1% of the incident photons produce photoelectrons, find the current in the cell.

When a beam of 10.6 eV photons of intensity 2.0 W //m^2 falls on a platinum surface of area 1.0xx10^(-4) m^2 and work function 5.6 eV, 0.53% of the incident photons eject photoelectrons. Find the number of photoelectrons emitted per second and their minimum and maximum energy (in eV). Take 1 eV = 1.6xx 10^(-19) J .

when a beam of 10.6 eV photons of intensity 2.0 W//m^(2) falls on a platinum surface of area 1.0 xx 10^(4) m^(2) and work function 5.6 eV , 0.53 % of the incidentphotons eject photoelectrons find the number of photoelectrons emited per second and their minimum energies (in eV)Take 1 eV= 1.6 xx 10^(-19) J

Radiation of frequency 1.5 times the threshold frequency is incident on a photosensitive material. If the frequency of incident radiation is halved and the intensity is doubled, the number of photoelectron ejected per second becomes:

On a photosensitive material, when frequency of incident radiation is increased by 30% kinetic energy of emitted photoelectrons increases from 0.4 eV to 0.9 eV . The work function of the surface is

A uniform monochromatic beam of light of wavelength 365xx10^(-9) m and intensity 10^(-8) Wm^(-2) falls on a surface having avsorption coefficient 0.8 and work functoin1.6 eV. Determine the rate of number of electrons emitted per m^(2) , power absorbed per m^(2) and the maximum kinetic energy of emitted photoelectrons.

If light of wavelength 6200Å falls on a photosensitive surface of work function 2 eV, the kinetic energy of the most energetic photoelectron will be

TARGET PUBLICATION-ELECTRONS AND PHOTONS-Competitive Thinking
  1. The momentum of a photon is 2 xx 10^(-16) gm - cm//sec. Its energy is

    Text Solution

    |

  2. If the energy of a photon corresponding to a wavelength of 6000 Å is 3...

    Text Solution

    |

  3. If we express the energy of a photon in KeV and the wavelength in angs...

    Text Solution

    |

  4. A metal surface of work function 1.07 eV is irradiated with light of w...

    Text Solution

    |

  5. The work function of metal is 1 eV. Light of wavelength 3000 Å is inc...

    Text Solution

    |

  6. Energy from the sun is recived on earth at the rate of 2 cal per cm^(2...

    Text Solution

    |

  7. when a monochromatic point source of light is at a distance 0.2 m from...

    Text Solution

    |

  8. When a metal surface is illuminated by light wavelengths 400 nm and 25...

    Text Solution

    |

  9. The velocity of the most energetic electrons emitted from a metallic s...

    Text Solution

    |

  10. A modern 200 W sodium street lamp emits yellow light of wavelength 0.6...

    Text Solution

    |

  11. Ultraviolet light of wavelength 300nn and intensity 1.0Wm^-2 falls on ...

    Text Solution

    |

  12. The number of photons falling per second on a completely darkened plat...

    Text Solution

    |

  13. Photoelectric emission is observed from a metallic surface for frequen...

    Text Solution

    |

  14. A photoelectric surface is illuminated successively by monochromatic l...

    Text Solution

    |

  15. Two identical photo-cathodes receive light of frequencies v1 and v2. ...

    Text Solution

    |

  16. A metal surface is illuminated by light of two different wavelengths 2...

    Text Solution

    |

  17. A photon of energy E ejects a photoelectron from a metel surface whose...

    Text Solution

    |

  18. Light of wavelength lambda(A) and lambda(B) falls on two identical met...

    Text Solution

    |

  19. The energy of the electromagetic wave is of the order of 15 keV. To wh...

    Text Solution

    |

  20. The photoelectric work function of a surface is 2.2 eV. The maximum ki...

    Text Solution

    |