Engineering Physics II Unit 1: Quantum Mechanics
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Questions and Answers

What is the main purpose of the Wien's Radiation Formula?

  • To calculate the speed of light in the medium of black body
  • To explain the observed spectral distribution of a black body radiation (correct)
  • To determine the total energy emitted by a black body
  • To describe the behavior of black holes

    • Why does the Wien's Radiation Formula have limitations?

  • It is not based on classical physics
  • It does not account for energy density
  • It is only applicable at low wavelengths (correct)
  • It fails to consider temperature effects

    • What did Rayleigh and Jean apply to electromagnetic black body radiation?

  • Classical law of equipartition of energy (correct)
  • Quantum mechanical principles
  • Einstein's theory of relativity
  • Newton's second law of motion

    • What phenomena does Quantum Mechanics aim to explain?

    <p>BlackBody Radiation</p> Signup and view all the answers

    What were the attempts made on the basis of classical physics in explaining black body radiation?

    <p>Wien's Radiation Formula, Rayleigh-Jean's Law, Stefan-Boltzmann's Law</p> Signup and view all the answers

    Why were the theoretical explanations based on classical physics not very successful in explaining black body radiation?

    <p>They failed to provide a complete spectrum for black body radiation</p> Signup and view all the answers

    Who is credited with the discovery of energy quanta and won the Nobel Prize in Physics in 1918?

    <p>Max Planck</p> Signup and view all the answers

    What is the name of the law that states the energy density of black body radiation is inversely proportional to the fourth power of wavelength?

    <p>Rayleigh-Jeans law</p> Signup and view all the answers

    What contradiction was known as 'Ultraviolet Catastrophe'?

    <p>Rayleigh-Jeans formula</p> Signup and view all the answers

    Who explained the Rutherford model by Old Quantum Theory of atom?

    <p>Niels Bohr</p> Signup and view all the answers

    What is the name of the German theoretical physicist known for his role as the originator of quantum theory?

    <p>Max Planck</p> Signup and view all the answers

    According to Rutherford, what did classical theory of electromagnetic radiation suggest about the stability of an atom?

    <p>An atom would collapse ultimately</p> Signup and view all the answers

    What phenomenon did the failure of Rayleigh-Jeans formula give the first indication of?

    <p>Inadequacy of classical physics</p> Signup and view all the answers

    What is the name given to the contradiction where the energy spectrum graph agreed for long wavelengths but went towards infinity at the shorter wavelength end?

    <p>'Ultraviolet Catastrophe'</p> Signup and view all the answers

    What did Planck's Radiation Law address inadequacies in?

    <p>'Rayleigh-Jeans formula'</p> Signup and view all the answers

    'Bohr Old Quantum Theory' explained that electrons are allowed to revolve only in ____________.

    <p>'Circular orbits'</p> Signup and view all the answers

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