Home
Class 11
PHYSICS
The wavelength of Lalpha line in X-ray s...

The wavelength of `L_alpha` line in X-ray spectrum of `._76Pt` is 1.32Å. The wavelength of `L_alpha` line in X-ray spectrum of another unknown element is 4.17Å. If screening constant for `L_alpha` line is 7.4, then atomic number of the unknown element is

A

78

B

47

C

40

D

35

Text Solution

Verified by Experts

The correct Answer is:
B
`sqrt(v) =a(Z-b)=sqrt(C/(lambda)) =a(Z-b)rArr sqrt((lambda_(2))/(lambda_(1)))=(a(78-7.4))/(a(Z_(2)-7.4))`
`Z_(2)=47`
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    RESONANCE|Exercise Exercise|19 Videos

  • CALORIMETRY

    RESONANCE|Exercise Exercise|19 Videos

Similar Questions

Explore conceptually related problems

The wavelength of H_(alpha) line is Balmer series is 6563 Å. Compute the wavelength of H_(beta) line of Balmer series.

The X - ray wavelength of L_(alpha) line of platinum (Z = 78) is 1.30 Å . The X - ray wavelength of L_(alpha) line of Molybdenum (Z = 42) is

The wavelength of k_alpha line in the X-ray spectrum for tungsten (Z=74) is 200 Å. What would be the wavelength of same line for platinum Z =78 ?

The wavelength of K_(alpha) –line characteristic X–rays emitted by an element is 0.32Å. The wavelength of K_(beta) –line emitted by the same element will be :–

The wavelength of K_(alpha) line for an element of atomic number 43 is lambda . Then the wavelength of K_(alpha) line for an element of atomic number 29 is

The wavelength of K_(alpha) X-ray line for an element is 0.42Å . Find the wavelength of K_(beta) line emitted by the same element.

The wavelength of K_(alpha) line in copper is 1.54 Å . The ionisation energy of K electron in copper in Joule is

The ratio of wavelength of K_alpha line of an element with atomic number 61 to wavelength of K_alpha line of an element with atomic number 21 is

Wavelength of K_alpha line of an element is lambda_0 . Find wavelength of K_beta - line for the same elemetn.

RESONANCE-ATOMIC PHYSICS-Exercise
  1. Linear momenta of a proton and an electron are equal. Relative to an e...

    Text Solution

    |

  2. Momentumof gamma - ray proton of energy 3 keV in kg-m/s will be

    Text Solution

    |

  3. Wrong statement in connection with Davisson-Germer experiment is

    Text Solution

    |

  4. In Davisson-Germer experiment the relation between the angle of diffra...

    Text Solution

    |

  5. In Davisson-Germer experiment an electron beam accelerated with 54 vol...

    Text Solution

    |

  6. Object are exposed to the X-rays in a dark room. They will appear

    Text Solution

    |

  7. The intensity of an X-ray beam reduces to 36.8% of its initial intensi...

    Text Solution

    |

  8. An X-ray tube operating at 50kV converts 1% energy in the form of X-ra...

    Text Solution

    |

  9. A beam of electron accelerated by a large potential difference V is ...

    Text Solution

    |

  10. Production of continuous X-rays is caused by

    Text Solution

    |

  11. The minimum wavelength lambdamin in the continuous spectrum of X-rays ...

    Text Solution

    |

  12. X -rays and gamma rays are both electromagnetic waves. Which of the fo...

    Text Solution

    |

  13. On increasing the filament current, the

    Text Solution

    |

  14. X -rays are known to be electromagnetic radiations. Therefore the X-ra...

    Text Solution

    |

  15. if lamda(v'),lamda(x) and lamda(m) represent the wavelengths of visibl...

    Text Solution

    |

  16. Characteristic X-rays of K-series are obtained when the electron trans...

    Text Solution

    |

  17. Which of the following is in the increasing order for penetrating powe...

    Text Solution

    |

  18. The wavelength of Lalpha line in X-ray spectrum of .76Pt is 1.32Å. The...

    Text Solution

    |

  19. Statement 1: In process of photoelectric emission, all emitted electro...

    Text Solution

    |

  20. Statement 1: When a beam of highly energetic neutrons is incident on a...

    Text Solution

    |