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Miaplacidus and Avior are two stars in the constellation Carina - AQA - A-Level Physics - Question 3 - 2021 - Paper 4
Question 3
Miaplacidus and Avior are two stars in the constellation Carina. Miaplacidus is a class A star. Avior is a class K star. Figure 2 shows how the intensity of radiati... show full transcript
Worked Solution & Example Answer:Miaplacidus and Avior are two stars in the constellation Carina - AQA - A-Level Physics - Question 3 - 2021 - Paper 4
Step 1
Explain the overall shape of the graph
Answer
The graph exhibits a characteristic absorption spectrum typical of stars. The shape indicates a continuous spectrum with specific absorption lines. A peak intensity is observed, indicating the predominant wavelengths emitted by the star. The dips in intensity correspond to specific absorption features where certain wavelengths have been absorbed by elements in the star's atmosphere.
Step 2
Describe the processes in the star that lead to the decreases in intensity
Answer
The decreases in intensity are attributed to the absorption of light by various elements in the stellar atmosphere. In an A-type star like Miaplacidus, hydrogen absorption lines (Balmer series) are prominent due to the high temperature of about 10,000 K. These lines diminish the intensity of specific wavelengths as photons are absorbed by hydrogen atoms. Additionally, there might be other absorption lines corresponding to heavier elements which further contribute to the intensity dips in the spectrum.
Step 3