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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 indicate the transition of an electron from the lowest energy level, draw an upward arrow starting from the lowest level (Z) towards the position above it in the energy diagram, showing that the electron is moving away from the atom.
Step 2
When an electron is ..................................................., as shown by arrow Y, electromagnetic radiation is .............................................................. by the atom.
Answer
When an electron is excited, as shown by arrow Y, electromagnetic radiation is emitted by the atom.
Step 3
The frequency of electromagnetic radiation involved in transition Z is ................................................. the frequency of the electromagnetic radiation involved in transition Y.
Answer
The frequency of electromagnetic radiation involved in transition Z is higher than the frequency of the electromagnetic radiation involved in transition Y.
Step 4
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 provide the wavelength measurements for hydrogen observed from both galaxies A and B compared to the laboratory on Earth. By identifying the shift in wavelength from the laboratory measurement (656 nm) to that of galaxy A (712 nm), we can determine that galaxy A is moving away from us. Similarly, galaxy B shows a further increase in wavelength (739 nm), indicating it is also moving away but at a higher velocity than galaxy A. The greater the shift in wavelength, the faster the galaxy is moving away, thus allowing astronomers to compare their relative motions.