Quantum Physics Quiz

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Questions and Answers

According to Bohr's second postulate, the angular momentum of an electron is an integral multiple of â„Ž /2Ï€. The S.I unit of Planck constant h is the same as...

  • Centripetal force
  • Energy
  • Linear momentum
  • Angular momentum (correct)

For a hydrogen atom, the minimum excitation energy (of n = 2) is...

  • 10.2 eV (correct)
  • 3.4 eV
  • 13.6 eV
  • -10.2 eV

Based on the Bohr atomic model, the radii of Bohr orbits are directly proportional to...

  • Principal quantum number
  • Cube of principal quantum number
  • Independent of principal quantum number
  • Square of principal quantum number (correct)

In De Broglie's Hypothesis, what property did he associate with matter?

<p>Wave-particle duality (B)</p> Signup and view all the answers

The experiment to study the characteristics of photoelectric effect involves...

<p>Analyzing electron emission due to light (A)</p> Signup and view all the answers

What relationship does the speed of an electron in the nth orbit of a hydrogen atom have with the principal quantum number?

<p>Inversely proportional (C)</p> Signup and view all the answers

According to De Broglie, with what are waves associated?

<p>All moving matter particles (A)</p> Signup and view all the answers

What determines the maximum velocity of a particle in photoelectric effect?

<p>Frequency of incident radiation (D)</p> Signup and view all the answers

What is the threshold wavelength of a metal with a work function of 4.2 eV?

<p>2959 â„« (B)</p> Signup and view all the answers

What does the term 'wave-particle duality' refer to in modern physics?

<p>Behavior of light as both waves and particles (B)</p> Signup and view all the answers

Which equation is associated with the photoelectric effect according to Einstein?

<p>$E = hf - \phi$ (C)</p> Signup and view all the answers

What is the definition of atomic number?

<p>Number of protons in an atom (B)</p> Signup and view all the answers

Which statement best describes mass number?

<p>Total number of protons and neutrons in an atom (C)</p> Signup and view all the answers

What are isotopes?

<p>Atoms with different numbers of protons and neutrons (A)</p> Signup and view all the answers

What is a common application of nuclear fusion?

<p>Powering stars like the Sun (B)</p> Signup and view all the answers

In the Bohr model, what happens when an electron transitions between energy levels?

<p>Energy is released by the electron (D)</p> Signup and view all the answers

What phenomenon causes a LED to emit visible white light?

<p>Holes and electrons recombine (D)</p> Signup and view all the answers

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