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Atoms Physics - Atoms

Gujarat Board (GSEB) - STD 12 Science - Physics (GSEB - English Medium). 83 questions in this chapter.

Question types

Atoms question types

83 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

83
Questions
6
Question groups
5
Question types
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 1M.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 2M.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 3M.C.Q (1 Marks)1 Mark
According to Bohr's Model, which is not possible energy value of emitted photon by hydrogen atom :
  • A
    1.9 eV
  • ✓
    11.1 eV
  • C
    13.6 Ev
  • D
    0.65 eV

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark
If ionisation energy of hydrogen atom in ground state is 13.6 eV , then ionisation energy of first excited state will be :
  • A
    Zero
  • B
    6.8 eV
  • C
    10.2 eV
  • ✓
    3.4 Ev

Answer: D.

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Q 5M.C.Q (1 Marks)1 Mark
In scattering experiment, $\alpha$-particles scattered due to which force :
  • A
    Nuclear force
  • ✓
    Coulomb's force
  • C
    (a) and (b)
  • D
    Gravitational force

Answer: B.

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Q 163 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 183 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 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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