Quantum Revision for Test

Which of the following provides evidence for discrete atomic energy levels? 

• β⁺ decay

• electron diffraction

• line spectra

• the photoelectric effect

Which row gives evidence for the wave nature of electrons and evidence for the particulate nature of light?

• A

• B

• C

• D

Which particle has the smallest de Broglie wavelength? 

• an electron moving at 4 × 10³ m s⁻¹

• a proton moving at 4 × 10³ m s⁻¹

• an electron moving at 8 × 10⁵ m s⁻¹

• a proton moving at 8 × 10⁵ m s⁻¹

A muon and an electron are travelling at the same speed.

Which row gives the particle with the greater kinetic energy and the particle with the longer de Broglie wavelength?

• A

• B

• C

• D

A particle has a kinetic energy of E_k and a de Broglie wavelength of λ.What is the de Broglie wavelength when the particle has a kinetic energy of 4E_k?

The diagram shows the energy levels in an atom drawn to scale. A transition from E₄ to E₂ causes the emission of a photon of green light.

Which transition could cause the emission of a photon of red light?

• E₂ to E₁

• E₃ to E₁

• E₃ to E₂

• E₄ to E₁

The diagram shows an energy level diagram for a hydrogen atom.

Electrons with energy 13.0 eV collide with atoms of hydrogen in their ground state.

What is the number of different wavelengths of electromagnetic radiation that could be emitted when the atoms de-excite?

• 0

• 3

• 6

• 7

The intensity of a monochromatic light source is increased. Which of the following is correct?

• A

• B

• C

• D

A photon of ultraviolet radiation has a frequency of 1.5 × 10¹⁵ Hz.

What is the momentum of the photon? 

• 3.3 × 10^–41 kg m s^–1

• 1.3 × 10^–40 kg m s^–1

• 3.3 × 10^–27 kg m s^–1

• 1.3 × 10^–26 kg m s^–1

Electromagnetic radiation incident on a metal surface can cause electrons to be emitted.

Which of the following statements is correct? 

• Every photon incident on the surface causes an electron to be emitted.

• All the emitted electrons have the same energy.

• The range of energy of the emitted electrons depends on the intensity of the radiation.

• If the incident radiation is of a single frequency, the number of electrons emitted per second increases if the intensity of the radiation increases.