Electron energy levels – MCQs (set 3)

Which of the diagrams below shows an example of an absorption spectrum?

• A

• B

• C

• D

When an atom is in its ground state, its electrons...

• are all in the lowest energy level

• do not move

• fill the energy levels starting from the lowest level

• are all in the nucleus.

When light from a star is passed through a diffraction grating it forms a spectrum. Which of the following statements is/are correct?

• The Sun creates a continuous spectrum of visible light

• Visible light received from the Sun has dark lines across its spectrum that correspond to the absorption of certain wavelengths by atoms in the Earth’s atmosphere.

• The photons in the emission spectrum are formed when electrons are moved from a lower energy level to a higher energy level within the atom.

Atomic line spectra can be accounted for by Bohr’s model of the atom, if the energy levels in atoms are

• quantised

• zero

• continuous

• infinite

The diagram shows some energy levels of an atom. The transition E₃ to E₁ corresponds to the emission of visible light. A transition corresponding to the emission of infrared radiation could be:

• E₁ to E₀

• E₄ to E₁

• E₁ to E₂

• E₃ to E₂

The diagram shows some of the electron energy levels for a mercury atom. Which of the lines A to D, drawn on the diagram, would correspond to the emission of the photon with the shortest wavelength?

• A

• B

• C

• D

The diagram below is drawn to scale. It shows some of the energy levels of an atom. Transition P results in the emission of a photon of wavelength 4.0 x 10^-7 m. Which one of the transitions A, B, C, or D could result in the emission of a photon of wavelength 8.0 x 10^-7 m?

• A

• B

• C

• D

The diagram shows some of the energy levels for a hydrogen atom. A free electron of kinetic energy 20.0 x 10^-19 J collides with a hydrogen atom in its ground state. The hydrogen atom is excited from its ground state to the first excited state. Calculate the kinetic energy of the free electron after the collision.

• 1.8 x 10^-19 J

• 3.6 x 10^-19 J

• 5.4 x 10^-19 J

• 16.4 x 10^-19 J

Which of the following can be explained only by the wave model of electromagnetic radiation?

• atomic line spectra

• electron diffraction

• photoelectric effect

• X-ray diffraction

When examined with a spectroscope, the emission spectrum from the gas in a discharge tube contains the following three frequencies: Frequency, P = 7.5 x 10¹⁴ Hz, Frequency, Q = 3.0 x 10¹⁴ Hz, Frequency, R = 3.8 x 10¹⁴ Hz. Which of A–E could represent the energy levels in the atoms of the gas in the tube?

• A

• B

• C

• D

• E