Home
Class 12
PHYSICS
The energy of a photon of light of wavel...

The energy of a photon of light of wavelength 450 nm is

A

`4.4 xx10^(-19) J`

B

`2.5 xx10^(-19) J`

C

`1.25 xx10^(-17) J`

D

`2.5 xx10^(-17) J`

Text Solution

Verified by Experts

The correct Answer is:
A
`E=(hc)/lamda=(6.6xx10^(-34)xx3xx10^8)/(450 xx10^(-9))=4.4 xx10^(-19)J`
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 energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV . This way the energy of an X - ray photon with wavelength 1 Å would be

Calculate the momentum of a photon of light of wavelength 500nm .

(a) Calculate the momentum of a photon of light of wavelength 500 nm. (b) Find the number of photons emitted per second by a 25 W sourse of monochromatic light of wave length 600 nm. (c) How many photons per second does a one watt bulb emit if its efficiency is 10% and the wavelength of light emitted is 500 nm? (d) Monochromatic light of wavelength 300 nm is incident normally on a surface of area 4 cm^(2) . If the intensity of light is 150 m W//m^(2) , determine the rate at which photons strike the surface.

The energy of a photon in eV of wavelength lambda nm will be

The energy of a photon of wavelength 390 nm is nearly

The number of photons of light having wavelength 100 nm which can provide 1 J energy is nearly:

Calculate the energy of a photon of blue light, lambda =450 nm in air (or vacuum).

ERRORLESS-ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY-NCERT BASED QUESTIONS (Photon and Photoelectric Effect)
  1. An electron and a photon have same wavelength of 10^(-9) m. If E is th...

    Text Solution

    |

  2. The wavelength of a 1 keV photon is 1.24 xx 10^(-9)m. What is the freq...

    Text Solution

    |

  3. The energy of a photon of light of wavelength 450 nm is

    Text Solution

    |

  4. If wavelength of photon and electron is same then ratio of total energ...

    Text Solution

    |

  5. Photoelectric effect supports quantum nature of light because

    Text Solution

    |

  6. The treshold wavelength for photoelectirc emission from a material ...

    Text Solution

    |

  7. A light whose frequency is equal to 6xx10^(14) Hz is incident on a met...

    Text Solution

    |

  8. The work function of a metal is 4.2 eV. Its threshold wavelength will...

    Text Solution

    |

  9. An electron microscope is used to probe the atomic arrangement to a re...

    Text Solution

    |

  10. Ultraviolet radiations of 6.2 eV fall on an aluminium surface (work fu...

    Text Solution

    |

  11. In a photoelectric experiment for 4000 Å incident radiation, the poten...

    Text Solution

    |

  12. Light of wavelength 4000 Å falls on a photosensitive metal and a negat...

    Text Solution

    |

  13. An electromagnetic radiation has an energy of 13.2 keV. Then the radia...

    Text Solution

    |

  14. Threshold wavelength for a metal having work function w(0) is lambda. ...

    Text Solution

    |

  15. The stopping potential necessary to reduce the phtoelectric current of...

    Text Solution

    |

  16. Light of wavelength 5000 Å falls on a sensitive plate with photoelectr...

    Text Solution

    |

  17. When light of wavelength 300 nm falls on a photoelectric emitter, phot...

    Text Solution

    |

  18. When yellow light is incident on a surface , no electrons are emitted ...

    Text Solution

    |

  19. Relation between the stopping potential V0 of a metal and the maximum ...

    Text Solution

    |

  20. When wavelength of incident photon is decreased then

    Text Solution

    |