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Atoms can emit or absorb electromagnetic radiation when electrons move between energy levels - OCR Gateway - GCSE Physics - Question 19 - 2023 - Paper 4
Question 19
Atoms can emit or absorb electromagnetic radiation when electrons move between energy levels. The diagram shows electron transitions Y and Z between energy levels i... show full transcript
Worked Solution & Example Answer:Atoms can emit or absorb electromagnetic radiation when electrons move between energy levels - OCR Gateway - GCSE Physics - Question 19 - 2023 - Paper 4
Step 1
Draw an arrow on the diagram showing the transition of an electron in the lowest energy level when it is lost from the atom.
Answer
To show the transition of an electron from the lowest energy level to being lost from the atom, draw an arrow pointing upwards from the first energy level (the lowest one) to beyond the energy levels, indicating that the electron is being emitted.
Step 2
Complete each sentence about the electron transitions in the diagram.
Answer
When an electron is ionised, as shown by arrow Y, electromagnetic radiation is emitted by the atom.
The frequency of electromagnetic radiation involved in transition Z is higher than the frequency of the electromagnetic radiation involved in transition Y.
Step 3
Explain how the data in the table can be used to compare the motion of galaxy A with galaxy B.
Answer
The data in the table shows the wavelengths of a specific hydrogen line observed from both galaxies and the Earth. By comparing the observed wavelengths:
- The wavelength for galaxy A (712 nm) is greater than that from the laboratory on Earth (656 nm), indicating that galaxy A is moving away from the Earth (redshift).
- The wavelength for galaxy B (739 nm) is also greater than that from the laboratory, implying galaxy B is also moving away from the Earth.
By comparing the amounts of redshift between galaxy A and galaxy B, we can determine not only that they are both moving away but also infer their relative velocities based on the degree of redshift.