Atoms

Class 12 · Physics

38 questions14 easy13 medium11 hard

Sample Questions

Q1.An electron in a hydrogen atom is in the n=6 state. How many spectral lines are possible when it returns to the ground state?

  • A6
  • B10
  • C15
  • D21

Q2.A 12.5 eV electron beam bombards gaseous hydrogen at room temperature. Which series of spectral lines will be emitted?

  • AOnly Lyman series
  • BLyman and Balmer series
  • CLyman, Balmer and Paschen series
  • DOnly Balmer series

Q3.Using Bohr's model, the speed of electron in n=2 orbit of hydrogen is:

  • A1.1 × 10⁶ m/s
  • B2.2 × 10⁶ m/s
  • C4.4 × 10⁶ m/s
  • D0.55 × 10⁶ m/s

Q4.The ground state energy of hydrogen atom is –13.6 eV. The ionisation energy of hydrogen is:

  • A–13.6 eV
  • B+13.6 eV
  • C27.2 eV
  • D3.4 eV

Q5.The shortest wavelength (series limit) of the Balmer series is when the transition is from n = ∞ to n = 2. Using R = 1.097×10⁷ m⁻¹, this wavelength is:

  • A364.6 nm
  • B656 nm
  • C121.5 nm
  • D820 nm

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Alpha Particle ScatteringAtomic SpectraBohr RadiusBohr's PostulatesDe Broglie's Explanation of Bohr's ModelDistance of Closest ApproachEnergy Levels of HydrogenHydrogen SpectrumImpact ParameterIonisation EnergyQuantisation of Angular MomentumRutherford's Nuclear ModelSpectral SeriesThomson's Plum Pudding Model

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