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Atoms Physics - Atoms

Gujarat Board (GSEB) - STD 12 Science - Physics (GSEB - English Medium). 74 questions in this chapter.

Question types

Atoms question types

74 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

74
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5
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5
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Sample Questions

Atoms questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 63 Marks Question3 Marks
Explain the assumption related to quantization of angular momentum in Bohr's theory.###Explain quantum condition for orbital motion of electron in hydrogen atom.###Explain Bohr's second postulate of quantisation by de Broglie hypothesis.
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Q 73 Marks Question3 Marks
Calculate the distance of closest approach of $\alpha$-particle which has kinetic energy 4.5 MeV , collides with the nucleus of $Z=80$ and reversed in its direction after rest.
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Q 93 Marks Question3 Marks
Energy of electron in hydrogen atom expressed by the following formula :
$E _n=-\left(\frac{13.6 eV}{n^2}\right) ; \text { Where, } n=1,2,3, \ldots$
by using this formula, proved that :
(a) The energy of electron -6.8 eV cannot be in H -atom.
(b) The distance of attached lines in spectrum of hydrogen.
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Q 16M.C.Q (1 Marks)1 Mark
The value of scattering angle of alpha particle for maximum value of impact parameter is :
  • ✓
    $90^{\circ}$
  • B
    $60^{\circ}$
  • C
    $45^{\circ}$
  • D
    $0^{\circ}$

Answer: A.

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Q 17M.C.Q (1 Marks)1 Mark
The value of excitation energy required to bring an electron to the first excited state in hydrogen atom is :
  • A
    13.6 Ev
  • ✓
    10.2 eV
  • C
    3.4 eV
  • D
    $-3,4 eV$

Answer: B.

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Q 18M.C.Q (1 Marks)1 Mark
Radius of first orbit of hydrogen atom is $0.53\ Å$, radius of fourth orbit will be :
  • A
    $0.193 \ Å $
  • B
    $4.24 \ Å$
  • C
    $2.12 \ Å$
  • ✓
    $8.48 \ Å$

Answer: D.

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Q 19M.C.Q (1 Marks)1 Mark
The total energy of electron in $n^{\text {th }}$ orbit, according to Bohr's theory :
  • ✓
    $E _n=\frac{-13.6}{n^2} eV$
  • B
    136 eV
  • C
    $E _n=13.6 n^2 eV$
  • D
    None of these

Answer: A.

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Q 20M.C.Q (1 Marks)1 Mark
According to Bohr's theory, if angular momentum of electron in excited hydrogen atom is $\left(\frac{2 h}{2 \pi}\right)$, then the energy will be :
  • ✓
    -3.4 Ev
  • B
    +3.4 eV
  • C
    -13.6 eV
  • D
    +13.6 eV

Answer: A.

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Q 225 Marks Questions5 Marks
On the basis of Bohr's postulates, derive the expression for orbital speed of electron for $n ^{\text {th }}$ stable orbit in hydrogen atom.
Energy in ground state of hydrogen atom is $(-) XeV$. What will be the kinetic energy in this state?
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Q 235 Marks Questions5 Marks
Write first and second postulates of Bohr's Atomic Model. Obtain the expression for radius and velocity of stable orbit of electron.###Explain Bohr's two postulates for hydrogen atom.
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