Home
Class 12
CHEMISTRY
A certain dye absorbs light of cerain wa...

A certain dye absorbs light of cerain wavelength and then fluorescence light of wavelength 5000 Å.Assuming that under given conditions , 50% of the absorbed energy is re-emitted out as fluorescence and the ratio of number of quanta emitted out to the number of quanta absorbed is 5:8, find the wavelength of absorbed light (in Å) : [hc=12400 eVÅ]

A

4000 Å

B

3000 Å

C

2000 Å

D

1000 Å

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • D BLOCK ELEMENTS

    RESONANCE ENGLISH|Exercise EXERCISE-3 PART-III|37 Videos

  • ELECTRO CHEMISTRY

    RESONANCE ENGLISH|Exercise PHYSICAL CHEMITRY (ELECTROCHEMISTRY)|53 Videos

Similar Questions

Explore conceptually related problems

A certain day absorbs lights of lamda=400 nm and then fluorescence light of wavelength 500 mn. Assuming that under given condition 40% of the absorbed energy is re-emitted as fluorescence, calculate the ratio of quanta obserbed to number of quanta emitted out.

A dye obsorbs light of lambda = 4530 Å and then flaorescences light of 5000Å .Assuming that uinder given condition 47% of the obserbed energy is re-emited out so flaurescence , calculate the ratio of quants emitted out to the number of quanta obserbed

A certain dye absorbs 4000 Å and fluoresces at 8000 Å. These being wavelengths of maximum absorption that under given conditions 50 % of the absorbed energy is emitted. Calculate the ratio of the no. of quanta emitted to the number absorbed.

Two source of light emit X - rays of wavelenght 1 nm and visible light of wavelength 500 nm respectively . Both the source emit light of the same power 200 W. The ratio of the number density of photons of X - rays to the number density of photons of the visible light of the given wavelengths

What is power (in watt) of a light source emitting 5.25 xx 10^(18) photons per second, while the wavelength of light is 620 nm ? (use hc = 12400 eVÅ )

Light of wavelength 5000 Å is incident on a slit of width 0.1 mm. Find out the width of the central bright line on a screen distance 2m from the slit?

There are materials which absorb photon of shorter wavelength and emit photons of longer wavelength. Can there be stable substances which absorb photons of larger wavelength and emit light of shorter wavelength.

A 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

If 5% of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per second by a 100 W lamp? Assume wavelength of visible light as 5.6xx10^(-5) cm.

Light of wavelength 5000 Å falls on a sensitive plate with photoelectric work function of 1.9 eV . The kinetic energy of the photoelectron emitted will be

RESONANCE ENGLISH-DPP-QUESTIONS
  1. if uncertainty in momentum is twice the uncertainty in position of an ...

    Text Solution

    |

  2. Which of the following statement is correct

    Text Solution

    |

  3. A certain dye absorbs light of cerain wavelength and then fluorescence...

    Text Solution

    |

  4. In a single isolated atom of hydrogen electron make transition from ...

    Text Solution

    |

  5. Two electrons A and B in an atom have the following set of quantum num...

    Text Solution

    |

  6. Which of the following pair of orbitals for mentioned species have equ...

    Text Solution

    |

  7. When photon of energy 4.25 eV strike the surface of metal A, the eject...

    Text Solution

    |

  8. Which of the following statements is incorrect with respect to V^"4+" ...

    Text Solution

    |

  9. Which of the following set of orbitals are arranged in correct energy ...

    Text Solution

    |

  10. Azimuthal quantum number (l) : It describes the shape of electron cl...

    Text Solution

    |

  11. Azimuthal quantum number (l) : It describes the shape of electron cl...

    Text Solution

    |

  12. Azimuthal quantum number (l) : It describes the shape of electron cl...

    Text Solution

    |

  13. In one experiment , a proton having kinetic energy of 1 eV is accelera...

    Text Solution

    |

  14. If the value of Azimuthal Quantum Numbe l for an electron in a particu...

    Text Solution

    |

  15. What is the value of ((n+l+m)/2) for all possible orbitals with number...

    Text Solution

    |

  16. What is the maximum possible number of electrons in an atom with (n+l=...

    Text Solution

    |

  17. In a sample one H atom is in 1^(st) excited state, two He^+ ion are in...

    Text Solution

    |

  18. Among the following , which orbital in Be^(3+) has same energy as that...

    Text Solution

    |

  19. Bombardment by alpha-particle leads to artificial distintegration in t...

    Text Solution

    |

  20. Which particle must have been produced in the following processes resp...

    Text Solution

    |