IB Physics HL C.5.4 Spectral line shifts Question Bank

Practise IB Physics SL/HL C.5.4 by applying spectral line shifts concepts to exam-style physics questions.

Exam points

identify the relevant physical quantity, model or diagram
apply the correct equation and units to the evidence
justify the result using conservation laws, fields or energy relationships

[Maximum number: 2]

A beam of coherent monochromatic light from a distant galaxy is used in an optics experiment on Earth.

The wavelength of the light in the beam when emitted by the galaxy was 621.4 nm .

Explain, without further calculation, what can be deduced about the relative motion of the galaxy and the Earth.

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C.5.4—Spectral line shifts question 1