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DP IB Physics: HL

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9.5 Doppler Effect

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Question 1

Marks: 1

A train is moving towards a stationary observer. The train sounds its horn.

What are the correct changes in frequency, wavelength and pitch of the horn as heard by the observer?

	frequency	wavelength	pitch
A.	higher	shorter	higher
B.	higher	shorter	lower
C.	lower	shorter	lower
D.	lower	longer	higher

Key Concepts

The Doppler Effect

Question 2

Marks: 1

A team of naturalists are researching the movement of whales in the ocean. They plan to calculate the velocity of a whale using the Doppler effect. The whale pod is moving towards the research team who are in a stationary boat.

Which equation will allow the researchers to investigate the velocity of the whales using the frequency of sound in water?

$λ' = λ (1 + \frac{u_{s}}{v})$
$f' = f (\frac{v}{v + u_{s}})$
$f' = f (\frac{v + u_{0}}{v})$
$f' = f (\frac{v}{v - u_{s}})$

Key Concepts

The Doppler Equation

Question 3

Marks: 1

Which diagram correctly represents redshift?

Key Concepts

Representing The Doppler Effect

Question 4

Marks: 1

What did the discovery of the Doppler redshift give scientists evidence for?

Newton's Third Law
The formation of solar systems
The Big Bang
Blueshift

Key Concepts

Uses of The Doppler Effect

Question 5

Marks: 1

Which equation can be used to calculate the Doppler shift for the sound of a person running away from an observer whilst blowing a whistle?

$f' = f (\frac{v + u_{0}}{v})$
$f' = f (\frac{v}{v - u_{s}})$
$f' = f (\frac{v - u_{0}}{v})$
$f' = f (\frac{v}{v + u_{s}})$

Key Concepts

The Doppler Equation

Question 6

Marks: 1

Which of the following is not a use of the Doppler effect?

Mapping the expansion of the universe
Measuring the rate of blood flow in patients
Finding planetary orbits around distant stars
Recording the speed of sound

Key Concepts

Uses of The Doppler Effect

Question 7

Marks: 1

Which statement about redshift is true?

Redshift shows all galaxies are moving towards the Earth
Redshift shows that the space between galaxies is expanding
Redshift is the change in pitch of the sound waves emitted from galaxies
Redshift is the expansion of stars

Key Concepts

Uses of The Doppler Effect

Question 8

Marks: 1

Which of the following equations will give an increase in the frequency of the observed wave according to the Doppler Effect?

$f' = f (\frac{v - u_{o}}{v})$
$λ' = λ (1 + \frac{u_{s}}{v})$
$f' = f (\frac{v + u_{o}}{v})$
$f' = f (\frac{v}{v + u_{s}})$

Key Concepts

The Doppler Equation

Question 9

Marks: 1

Which of the following statements about the Doppler effect is correct?

When a galaxy moves towards the Earth the spectral absorption lines observed will have a longer wavelength
When a car starts to move away from an observer, the sound from the exhaust appears at a lower frequency to the observer than the driver
When a train moves towards a station, it's horn will sound lower to the passengers on the platform compared to the passengers in the train
Light from a star moving towards the Earth is redshifted

Key Concepts

Uses of The Doppler Effect

Question 10

Marks: 1

Which of the following is an equation to calculate the Doppler shift of light?

$\frac{Δ f}{f} \approx \frac{c}{v}$
$\frac{f}{Δ f} \approx \frac{v}{c}$
$\frac{v}{f} \approx \frac{c}{Δ f}$
$\frac{Δ f}{f} \approx \frac{v}{c}$

Key Concepts

The Doppler Equation

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