Home
Class 11
CHEMISTRY
A 25 watt bulb emits monochromatic yello...

A 25 watt bulb emits monochromatic yellow light of wavelength of ` 0. 57 mu` m. Calculate the rate of emission of quanta per second .

Text Solution

Verified by Experts

Energy of one photon,
`E = hv = (hc)/lambda`
`h = 6.626 xx 10^(-34) Js`
`c = 3.0 xx 10^(8) ms^(-1), lambda = 0.57 mu m`.
`=0.57 xx 10^(-6) ms^(-1)`
`E = (6.63 xx 10^(-34) xx 3.0 xx 10^8)/(0.57 xx 10^(-6))`
`=3.487 xx 10^(-19) J`
Now , 25 Watt = 25 J/s
`:.` No. of photons emitted per second = `(25)/(3.487 xx 10^(-19))`
`=7.17 xx 10^(19) s^(-1)`.
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise NCERT (Exemplar Problems) (Multiple Choice Questions (Type-I)|16 Videos
  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise NCERT (Exemplar Problems) (Multiple Choice Questions (Type-II)|5 Videos
  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise Advanced Level (Problems)|12 Videos
  • STATES OF MATTER : GASES AND LIQUIDS

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos
  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Unit Practice Test|12 Videos

Similar Questions

Explore conceptually related problems

A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

A 100 watt bult emits monochromatic light of wavelength 400 nm. Calcualte the number of photons emitted per second by the bulb.

A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x xx 10^20 . The value of x is _______. (Nearest integer) [Given : h = 6.63 xx 10^(-34) Js and c = 3.0 xx 10^8 ms^(-1) ]

A 50 watt bulb emits monochromatic red light of wavelength of 795 nm. The number of photons emitted per second by the bulb is x xx 10^20 . The value of x is _______. (Nearest integer) [Given : h = 6.63 xx 10^(-34) Js and c = 3.0 xx 10^8 ms^(-1) ]

A 100 W point source emits monochromatic light of wavelength 6000 A Calculate the total number of photons emitted by the source per second.

A 100 watt buble emits monochromatic light of wavelength 400 nm. Then the number of photons emitted per seccond by the buble is nearly -

MODERN PUBLICATION-STRUCTURE OF ATOM-NCERT FILE SOLVED (TEXT BOOK EXERCISES)
  1. A photon of wavelength 4 xx 10^(-7) m strikes on metal surface , the ...

    Text Solution

    |

  2. Electromagnetic radiation of wavelength 242 nm is just sufficient to i...

    Text Solution

    |

  3. A 25 watt bulb emits monochromatic yellow light of wavelength of 0. 5...

    Text Solution

    |

  4. Electrons are emitted with zero velocity from a metal surface when it ...

    Text Solution

    |

  5. what is the wavelength of light emitted when the electron in a hydroge...

    Text Solution

    |

  6. How much energy is required to ionise a H - atom if the electron occu...

    Text Solution

    |

  7. What is the maximum number of emission lines when the excited electro...

    Text Solution

    |

  8. a. The energy associated with the first orbit in the hydrogen atom is ...

    Text Solution

    |

  9. Calculate the wave number for the longest wavelength transition in the...

    Text Solution

    |

  10. What is the energy in joules required to shift the elertcon of the hyd...

    Text Solution

    |

  11. The electron energy in hydrogen atom is given by E(n)=(-2.18xx10^(-18)...

    Text Solution

    |

  12. Calculate the wavelength of an electron moving with a velocity fo 2. ...

    Text Solution

    |

  13. The mass of an electron is 9.1xx10^(-31)kg. If its K.E. is 3.0xx10^(-2...

    Text Solution

    |

  14. Which of the following are isoelectronic species, i.e., those having t...

    Text Solution

    |

  15. i. Write the electronic conifigurations of the following ions: a. H^...

    Text Solution

    |

  16. What is the lowest value of n that allows g orbitals to exist?

    Text Solution

    |

  17. An electron is in one of the 3d orbitals. Give the possible values of ...

    Text Solution

    |

  18. An atom of an element contains 29 electrons and 35 neutrons. Deduce ...

    Text Solution

    |

  19. Give the number of electrons in the species H2^+, H2 and O2^+.

    Text Solution

    |

  20. a. An atomic orbital has n=3. What are the possible values of l and m?...

    Text Solution

    |