Home
Class 12
PHYSICS
The frequency of the incident light fall...

The frequency of the incident light falling on a photosensitive metal plate is doubled. The kinetic energy of the emitted photoelectron is :

A

unchanged

B

doubled

C

less than doubled

D

more than doubled.

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(k)=hv-phi_(0) rArr E_(k).=2hv-phi_(0)`
`:. (E_(k).)/(E_(k))=(2hv-phi_(0))/(hv-phi_(0))=(2((hv-phi_(0))/(2)))/(hv-phi_(0))s`
Clearly `(E_(k).)/(E_(k)) gt 2`
so `E_(k). gt 2E_(k)`
Promotional Banner

Topper's Solved these Questions

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-II)|63 Videos

  • ELECTRONS & PHOTONS

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-III)|9 Videos

  • ELECTROMAGNETIC WAVES

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS|4 Videos

  • ELECTROSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTIONS |39 Videos

Similar Questions

Explore conceptually related problems

The kinetic energy of the photoelectrons depends upon:

The maximum kinetic energy of emitted photoelectrons depends on

When light of frequency 6 xx 10^(14) Hz is incident on a photosensitive metal, the kinetic energy of the photoelectron ejected is 2e V. Calculate the kinetic energy of the photoelectron in eV when light to frequency 5 xx 10^(14) Hz is incident on the same metal. Given Planck's constant, h = 6.625 xx 10^(-34) Js , 1 eV = 1.6 xx 10^(-19) .

Light of wavelength 4700Å is incident on a metal plate whose work function is 2 eV. Then maximum kinetic energy of the emitted photoelectron would be

It the velocity of a body is doubled its kinetic energy.

Light of wavelength lambda = 400 nm is incident on a photosensitive metal whose work function is 2 eV. The maximum kinetic energy of photo electrons emitted will be

For a metal the maximum wavelength required for photoelectron emission is 340 nm, find the work function. If the radiation of wavelength 250 nm falls on the surface of the given metal. Find the maximum kinetic energy of emitted photo electrons in eV. Given Planck's constant = 6.625 xx 10^(-34) Js , velocity of light in vacuum is 3 xx 10^(8)ms^(-1) .

MODERN PUBLICATION-ELECTRONS & PHOTONS-RECENT COMPETITIVE QUESTIONS
  1. The frequency of the incident light falling on a photosensitive metal ...

    Text Solution

    |

  2. According to Einstein's photoelectric equation the graph of K.E. of th...

    Text Solution

    |

  3. An electron is moving in an orbit of a hydrogen atom from which there ...

    Text Solution

    |

  4. v(1) is the frequency of the series limit of Lyman series, v(2) is te ...

    Text Solution

    |

  5. The de-Broglie wavelength of the electron in the ground state of the h...

    Text Solution

    |

  6. The photoelectric threshold wavelength for silver in lambda(0).The ene...

    Text Solution

    |

  7. An electron of mass m(e) and a proton of mass m(p) are moving with the...

    Text Solution

    |

  8. Pick out the wrong statement.

    Text Solution

    |

  9. A proton and an alpha particle are accelerated through the same potent...

    Text Solution

    |

  10. In hydrogen atom , electron excites from ground state of higher energy...

    Text Solution

    |

  11. An alpha - particle and a proton moving with the same kinetic energy e...

    Text Solution

    |

  12. X- rays, gamma rays and microwaves travelling in vacuum have

    Text Solution

    |

  13. If n is the orbit number of the electron in a hydrogen atom , the corr...

    Text Solution

    |

  14. A charged particle with a velocity 2 xx 10^3 ms^-1 passes undeflected ...

    Text Solution

    |

  15. Maximum velocity of the photoelectron emitted by a metal is 1.8 xx 10^...

    Text Solution

    |

  16. lamda(1) and lamda(2) are used to illuminated the slits. beta(1) and b...

    Text Solution

    |

  17. What is the de Broglie wavelength of the electron accelerated through ...

    Text Solution

    |

  18. The maximum kinetic energy of emitted photoelectrons depends on

    Text Solution

    |

  19. Find the de-Broglie wavelength of an electron with kinetic energy of 1...

    Text Solution

    |

  20. Light of two different frequencies whose photons have energies 1 eV an...

    Text Solution

    |

  21. The best waves for emission of electrons from a surface :

    Text Solution

    |