photon

The diagram shows some of the energy levels of a hydrogen atom.

An excited electron in the level –0.54 eV drops to the level –13.60 eV, resulting in the release of at least one photon.

Which of the following photon energy values could not be produced from this electron transition?

• 0.31 eV

• 0.54 eV

• 12.09 eV

• 13.06 eV

The diagram shows some of the energy levels for a hydrogen atom.

Which of the following expressions is equal to the lowest frequency of light possible from a transition between these energy levels?

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The diagram shows some of the energy levels for a hydrogen atom.

Electrons in this atom are excited from the ground state to the energy level n = 3. How many different frequencies of radiation can be emitted from this atom as electrons return to the ground state?

• 1

• 2

• 3

• 4

In an atom, an electron drops from energy level E2 to energy level E1, as shown.

A photon of wavelength λ is emitted.
Which of the following expressions gives the energy E2?

An electron has a de Broglie wavelength of 1.55 × 10^{-9} m. Which of the following gives the speed, in m s^{-1}, of this electron?

• A

• B

• C

• D

The diagram shows an electron transition between two energy levels in a hydrogen atom.

Which of the following could not have caused this transition?

• The atom absorbing a photon with an energy of 13.6 eV.

• The atom absorbing a photon with an energy of 10.2 eV.

• An electron with a kinetic energy of 13.6 eV colliding with the atom.

• An electron with a kinetic energy of 10.2 eV colliding with the atom.

Electromagnetic radiation can be described in terms of a photon model. Which of the following demonstrates the photon model of light?

• diffraction patterns

• Huygens' construction

• photoelectric effect

• plane polarisation

Which of the following describes threshold frequency?

• The frequency of light that causes photoelectrons to have maximum kinetic energy.

• The frequency of light emitted when excited electrons fall to the ground state.

• The minimum frequency of light that can cause an electron to leave a surface.

• The maximum frequency of light which excites an electron in the ground state.

The de Broglie wavelength for a moving electron is 5.47 × 10–10 m.
Which of the following expressions gives the speed of the electron in m s^-1?

• A

• B

• C

• D

An electron has a de Broglie wavelength of 3.5 × 10^-10 m. Which of the following expressions gives the velocity of the electron in m s^-1?

• A

• B

• C

• D