Physics (AS & A Level) · Oct / Nov 2025 · Paper 53 · Question 2
9702
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A student investigates light from different galaxies. Fig. 2.1 shows the lines in the absorption spectrum from a distant galaxy. λ increasing wavelength Fig. 2.1 The wavelength of one of the lines in the absorption spectrum is λ. The wavelength of this spectral line in the laboratory is λ0. The observations of the same spectral line are repeated for different galaxies. The student determines the distance d of each galaxy from the Earth. It is suggested that λ and d are related by the equation λ – λ0 λ0 = Hd c where c is the speed of light in free space and H is the Hubble constant. d
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2(a)[1]
2(b)[2]
2(c)(i)[2]
2(c)(ii)[2]
2(c)(iii)[2]
2(c)(iv)[2]
2(d)[2]
2(e)[2]
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