The radius of the first Bohr orbit of hydrogen atom is 0.529 &Ari

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91.

Identify the nuclear reaction that differs from the rest.

  • γ- decay

  • κ- capture

  • Positron emission

  • β-decay


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92.

The radius of the first Bohr orbit of hydrogen atom is 0.529 Å. The radius of the third orbit of H+ will be

  • 8.46 Å

  • 0.705 Å

  • 1.59 Å

  • 4.29 Å


D.

4.29 Å

According to Bohr model, radius of hydrogen atom

(rn) = 0.529 × n2Z Å

   r3 = 0.529 × 321

       = 4.761 Å


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93.

Which diagram best represents the appearance of the line spectrum of atomic hydrogen in the visible region?


94.

The correct set of quantum numbers (n, and m respectively) for the unpaired electron of chlorine atom is :

  • 2, 1, 0

  • 2, 1, 1

  • 3, 1, 1

  • 3, 2, 1


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95.

The relationship between the energy E1 of the radiation with a wavelength 8000 Å and the energy E2 of the radiation with a wavelength Å 16000  is:

  • E1 = 6E2

  • E1 = 2E2

  • E1 = 4E2

  • E1 = 4E2


96.

Calculate the mass loss in the following.

H12 + H13  H24 + n01

[Given the masses : 2H = 2.014;3H = 3.016; He = 4.004; n = 1.008 amu]  

  • 0.018 amu

  • 0.18 amu

  • 0.0018 amu

  • 1.8 amu


97.

The observation that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration and not otherwise is associated with:

  • Pauli's exclusion principle

  • Hund's rule of maximum multiplicity

  • Heisenberg's uncertainty relation

  • Ritz combination principle


98.

The first artificial disintegration of an atomic nucleus was achieved by

  • Geiger

  • Wilson

  • Madam Curie

  • Rutherford


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99.

When any radioactive element emits β particle, some product is obtained. They both are

  • isotopes

  • isobars

  • isomers

  • isotoes


100.

Electrical field is used to deflect

  • α and β particles

  • α and γ particles

  • α,  β and γ particles

  • β and γ particles


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