NCERT/Class 12/Physics/Dual Nature of Radiation and Matter

Dual Nature of Radiation and Matter

Class 12 · Physics

38 questions14 easy13 medium11 hard

Sample Questions

Q1.A particle is moving with kinetic energy equal to its rest mass energy m₀c² (relativistic case). Its de Broglie wavelength is λ = h/p where p = γm₀v. For a non-relativistic electron with KE = 100 eV, which formula for λ is most appropriate?

  • Aλ = h/√(2m_e × KE)
  • Bλ = h/(m_e × v) where v = c
  • Cλ = hc/KE
  • Dλ = h × KE

Q2.Einstein's photoelectric equation is:

  • AKmax = hν + φ₀
  • BKmax = hν – φ₀
  • CKmax = φ₀ – hν
  • DKmax = hν × φ₀

Q3.The minimum energy required for an electron to escape from the surface of a metal is called:

  • AKinetic energy
  • BThreshold energy
  • CWork function
  • DIonisation energy

Q4.The work function of caesium is 2.14 eV. What is the threshold frequency for caesium? (h = 6.63 × 10⁻³⁴ J·s)

  • A5.16 × 10¹⁴ Hz
  • B5.16 × 10¹¹ Hz
  • C3.22 × 10¹⁴ Hz
  • D1.42 × 10¹⁴ Hz

Q5.In a photoelectric experiment, the stopping potential was found to vary with frequency as: V₀ = (h/e)ν – φ₀/e. If the x-intercept of the V₀ vs ν graph is 5.0 × 10¹⁴ Hz, what is the work function of the metal?

  • A3.32 × 10⁻¹⁹ J = 2.07 eV
  • B3.32 × 10⁻¹⁶ J
  • C5.0 × 10¹⁴ eV
  • D1.24 eV

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

De Broglie WavelengthEinstein's Photoelectric EquationMatter WavesPhotoelectric EffectPhotonPlanck's ConstantSaturation CurrentStopping PotentialThreshold FrequencyWave-Particle DualityWork Function

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