Home
Class 11
PHYSICS
A metal surface is illuminated by light ...

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are `mu_1` and `mu_2` respectively. If the ratio `u_1: u_2 = 2:1 and hc= 1240 eV` , the work function of the metal is nearly.
(a)3.7 eV (b) 3.2 eV
(c ) 2.8eV (d) 2.5eV.

A

3.7 eV

B

3.2 eV

C

2.8 eV

D

2.5 eV

Text Solution

Verified by Experts

The correct Answer is:
A
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

A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are mu_1 and mu_2 respectively. If the ratio u_1: u_2 = 2:1 and hc= 1240 eV nm, the work function of the metal is neraly. (a)3.7 eV (b) 3.2 eV (c ) 2.8eV (d) 2.5eV.

A metal is illumimated by light of two different wavelength 248nm and 310 nm . The maximum speeds of the photoelecrtron corresponding in these wavwlength are u_(1) and u_(2) respectively . If the ratio u_(1) : u_(2) = 2 : 1 and hc = 1240 eVnm , the work function of the inetial is rearly

A metal surface is illuminated by the protons of energy 5 eV and 2.5 eV respectively . The ratio of their wavelength is

The surface of a metal is illuminated with light of wavelength 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. What is the work function of the metal ? [ hC=1240 eV*nm ]

A sodium (Na) surface is illuminated with light of wavelength 300 nm . The work function for Na metal is 2.46eV . The kinetic enegry of the ejected photoelectrons is

The work function of a metal is 4.2 eV , its threshold wavelength will be

Light of wavelength 1824 Å , incident on the surface of a metal , produces photo - electrons with maximum energy 5.3 eV . When light of wavelength 1216 Å is used , maximum energy of photoelectrons is 8.7 eV . The work function of the metal surface is

Surface of certain metal is first illuminated with light of wavelength lambda_(1)=350 nm and then, by light of wavelength lambda_(2)=540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to : (Energy of photon =(1240)/(lambda("in nm"))Ev

Radiation of wavelength 310 nm is incidenton a metal surface of work function 1eV . Find maximum speed of photoelectrons emitted . ( Closed value )

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

    |