Home
Class 12
PHYSICS
The work function of a metal is in the r...

The work function of a metal is in the range of 2 eV to 5 eV. Find which of the following wavelength of light cannot be used for photoelectric effect. (Consider, Planck's constant `=4xx10^(-15)" eV - s, velocity of light "=3xx10^(8)ms^(-1))`

A

510 nm

B

650 nm

C

400 nm

D

570 nm

Text Solution

Verified by Experts

The correct Answer is:
B
`lamda =(hc)/phi`
`lamda_("min") = (4xx10^(-15) xx3 xx10^8)/(5eV) = 240 nm`
`lamda_("max") = (4xx10^(-15) xx3 xx10^8)/(2eV) = 600 nm`
Promotional Banner

Topper's Solved these Questions

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise NCERT BASED QUESTIONS (X-Rays)|34 Videos

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise PAST YEARS QUESTIONS|71 Videos

  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Matter Waves)|24 Videos

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos

  • ELECTRONICS

    ERRORLESS|Exercise Assertion & Reason|26 Videos

Similar Questions

Explore conceptually related problems

The work function of lithium is 2.5 eV. what is the maximum wavelength of light that can cause the photoelectric effect in lithium?

A photon of wavelength 300nm interacts with a stationary hydrogen atom in ground state. During the interaction, whole energy of the photon is transferred to the electron of the atom. State which possibility is correct, (consider, Plank's constant =4xx10^(-15) eVs, velocity of light =3xx10^(8)ms^(-1) ionisation energy of hydrogen =13.6 eV)

The work function of a metal is 2.5 eV. Light of wavelength 3600 Å is incident on this metal surface. The velocity of emitted photoelectrons will be

The work function of a metal is 4 eV if 5000 Å wavelength of light is incident on the metal. Is there any photo electric effect ?

Work functions for metals A and B are 2 eV and 4 eV respectively. Which metal has a lower threshold wavelength and why ?

A metal whose work function is 3.3eV is illuminated by light of wavelength 3 xx 10^(-7)m . What is the threshold frequency for photoelectric emission? Plank's constant = 6.6 xx 10^(-34) Js?

ERRORLESS-ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY-NCERT BASED QUESTIONS (Photon and Photoelectric Effect)
  1. If the energy of a photon corresponding to a wavelength of 6000 Å is 3...

    Text Solution

    |

  2. The threshold frequency for a metallic surface corresponds to an energ...

    Text Solution

    |

  3. The work function of a metal is in the range of 2 eV to 5 eV. Find whi...

    Text Solution

    |

  4. The wavelength of a photon needed to remove a proton from a nucleus wh...

    Text Solution

    |

  5. The threshold frequency for a certain photosensitive metal is v(0). Wh...

    Text Solution

    |

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

    Text Solution

    |

  7. The stopping potential for photoelectrons from a metal surface is V(1)...

    Text Solution

    |

  8. The work functions of metals A and B are in the ratio 1 : 2. If light ...

    Text Solution

    |

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

    Text Solution

    |

  10. Two identical metal plates show photoelectric effect. Light of wavelen...

    Text Solution

    |

  11. When radiation of wavelength lambda is incident on a metallic surface...

    Text Solution

    |

  12. Consider a beam of electrons (each electron with energy E(0)) incident...

    Text Solution

    |

  13. In an experiment of photoelectric effect the stopping potential was me...

    Text Solution

    |

  14. Light of wavelength 500 nm is incident on a metal with work function 2...

    Text Solution

    |

  15. A photon of wavelength 300nm interacts with a stationary hydrogen atom...

    Text Solution

    |

  16. In a photoemissive cell, with exiciting wavelength is changed to (33la...

    Text Solution

    |

  17. The eye can detect 5xx10^(4) photons (m^2s)^(-1) of green light (lamda...

    Text Solution

    |

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

    Text Solution

    |

  19. Work function of lithium and copper are respectively 2.3 eV and 4.0 eV...

    Text Solution

    |

  20. In the arrangement shown in figure, y = 1.0 mm, d = 0.24 mm and D = 1...

    Text Solution

    |