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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 ℎ /2π. 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?

Wave-particle duality Signup and view all the answers

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

Analyzing electron emission due to light 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?

Inversely proportional Signup and view all the answers

According to De Broglie, with what are waves associated?

All moving matter particles Signup and view all the answers

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

Frequency of incident radiation Signup and view all the answers

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

2959 Å Signup and view all the answers

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

Behavior of light as both waves and particles Signup and view all the answers

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

$E = hf - \phi$ Signup and view all the answers

What is the definition of atomic number?

Number of protons in an atom Signup and view all the answers

Which statement best describes mass number?

Total number of protons and neutrons in an atom Signup and view all the answers

What are isotopes?

Atoms with different numbers of protons and neutrons Signup and view all the answers

What is a common application of nuclear fusion?

Powering stars like the Sun Signup and view all the answers

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

Energy is released by the electron Signup and view all the answers

What phenomenon causes a LED to emit visible white light?

Holes and electrons recombine Signup and view all the answers