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7.2 The Universe and red-shift

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Question 15
F

A train sounds its horn as it moves along a track.

The horn makes a sound with a frequency of 400 Hz.

The speed of sound in air is 340 m/s.

a.

Write down the equation linking wave speed (vvv), frequency (fff) and wavelength (λ\lambdaλ).

[1]
b.

Calculate the wavelength of the sound made by the horn.

[2]
c.

The train moves towards a person standing on a platform. The person hears a frequency of 425 Hz.

Calculate the wavelength of the sound reaching the person.

[2]
d.

Explain why the wavelength of the sound reaching the person is shorter than the wavelength of the sound made by the horn.

[2]
Markscheme

7.2 The Universe and red-shift Questions

  1. GCSE
  2. /Physics
  3. /7.2 The Universe and red-shift

94 exam-style questions on Edexcel GCSE Physics 7.2 The Universe and red-shift, covering 7.2.1 Big Bang and Steady State theories, 7.2.2 Evidence for the Big Bang, 7.2.3 The Doppler effect and red-shift, 7.2.4 Red-shift as evidence for an expanding Universe, and 7.2.5 The CMB and the accepted model. Each one has a worked solution and a mark scheme showing where the marks go.

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