CIE A Level Physics

Topic Questions

A LevelPhysicsCIETopic Questions22. Quantum Physics22.3 Quantisation of Energy

Syllabus Edition

First teaching 2020

Last exams 2024

|

22.3 Quantisation of Energy

DownloadView
Medium
1a
Sme Calculator4 marks

The energy levels of a hydrogen atom are shown in Fig. 1.1.

                                                                                  

22-3-1a-m-hydrogen-energy-levels-sq-cie-a-level

Fig. 1.1

 

Calculate the wavelength of radiation emitted when an electron falls from level n = 4 to the ground state in the hydrogen atom.

How did you do?

1b
Sme Calculator3 marks

When an electron of energy 1.84 × 10−17 J collides with a hydrogen atom, photons of six different energies are emitted.  

Sketch arrows on Fig. 1.1 to show the transitions responsible for these photons. 

How did you do?

1c
Sme Calculator3 marks

Calculate the wavelength of the photon with the smallest energy. Give your answer to an appropriate number of significant figures. 

How did you do?

1d
Sme Calculator2 marks

One way to excite a hydrogen atom is by the absorption of a photon. 

Explain why, for a particular transition, the photon must have an exact amount of energy. 

How did you do?

Did this page help you?

2a
Sme Calculator2 marks

The lowest energy levels of a hydrogen atom are represented in Fig. 1.1. 

22-3-2a-m-energy-levels-j-sq-cie-a-level

Fig 1.1

 

Identify the transition that produces a photon with frequency of 3.3 × 1016 Hz.

How did you do?

2b
Sme Calculator3 marks

An excited hydrogen atom can emit photons of certain discrete frequencies in various regions of the electromagnetic spectrum. Three possible transitions are shown in Fig. 1.2.

 22-3-2b-m-energy-levels-j-with-transitions-sq-cie-a-level
Fig. 1.2
 
Identify the transitions in Fig. 1.2 which produce a photon in the following regions of the electromagnetic spectrum:
 
(i)
Ultraviolet
[1]
 
(ii)
Visible
[1]
 
(iii)
Infrared
[1]

How did you do?

2c
Sme Calculator3 marks

Explain why the emitted photons in part (b) have certain discrete frequencies.

How did you do?

2d
Sme Calculator3 marks

An electron in the hydrogen atom is ionised by a photon of light with frequency 5.2 × 1016 Hz. 

Calculate the kinetic energy of the ionised electron.

 

kinetic energy .................................... J 

How did you do?

Did this page help you?

3a
Sme Calculator5 marks

Transitions between three energy levels in a particular atom give rise to three spectral lines.

In decreasing magnitudes, these are related to the wavelengths, λ1, λ2, and λ3,  

Use a diagram to show that the equation that relates λ1, λ2, and λ3 is:

 

1 over lambda subscript 1 space equals space 1 over lambda subscript 2 space plus space 1 over lambda subscript 3

 

 

How did you do?

3b
Sme Calculator6 marks

An atom has a ground state energy of −8.80 eV. The complete line emission spectra for this atom is shown in Fig. 1.1.

 22-3-3b-m-emission-spectra
Fig. 1.1
 
Sketch a diagram of the possible energy levels for the atomic line spectra shown in Fig 1.1. Label each energy level with the value of its energy.
 

How did you do?

Did this page help you?