Doppler Effect 1 - Assessment

1.

Multiple Choice

15 mins

1 pt

What would happen to a frequency that a listener hears when the source slows down as the source approaches the listener.

Increase

Decrease

Remains the same

2.

Multiple Choice

15 mins

1 pt

What would happen to a frequency that a listener hears when the source slows down as the source drives away from the listener.

Increase

Decrease

Remains the same

3.

Multiple Choice

15 mins

1 pt

An ambulance is travelling towards a hospital at a constant velocity of 30 m∙s-1.

The diagram above shows the wave fronts of the sound produced from the siren as a result of this motion.

At which side of the diagram, X or Y, is the hospital situated?

X

Y

4.

Multiple Choice

15 mins

1 pt

Was the sound source moving TOWARDS or AWAY FROM the listener?

Towards

Away from

5.

Multiple Choice

15 mins

1 pt

When the ambulance moves at a constant speed, a stationary observer detects a frequency that is lower than that emitted by the siren.Is the ambulance moving towards or away from the observer

Towards

Away

6.

Multiple Choice

15 mins

1 pt

An ambulance is travelling towards a hospital at a constant velocity of 30 m∙s-1.The siren of the ambulance produces sound of frequency 400 Hz. Take the speed of sound in air as 340 m∙s-1.

Calculate the frequency of the sound of the siren heard by a person standing at the hospital.

400 Hz

501,43 Hz

478,32 Hz

438,71 Hz

7.

Multiple Choice

15 mins

1 pt

An ambulance is moving towards a stationary listener at a constant speed of 30 m∙s-1. The siren of the ambulance emits sound waves having a wavelength of 0,28 m. Take the speed of sound in air as 340 m∙s-1.

Calculate the frequency of the sound waves emitted by the siren as heard by the ambulance driver.

1 331,80 Hz

1 214,29 Hz

1 335,72 Hz

1202,29 Hz

8.

Multiple Choice

15 mins

1 pt

An ambulance is moving towards a stationary listener at a constant speed of 30 m∙s-1. The siren of the ambulance emits a frequency of 1 214,29 Hz. Take the speed of sound in air as 340 m∙s-1.

Calculate the frequency of the sound waves emitted by the siren as heard by the listener.

1 331,80 Hz

1 214,29 Hz

1 367,32 Hz

2 347,68 Hz

9.

Multiple Choice

15 mins

1 pt

The siren of the ambulance produces sound of frequency 400 Hz. Take the speed of sound in air as 340 m∙s-1. Calculate the wavelength of the sound.

0.98 m

0.76 m

0,85 m

1.34 m

10.

Multiple Choice

15 mins

1 pt

Use the information in the table to calculate the speed of sound during the investigation. Choose the closest option.

$336,15m\cdot s^{-1}$

$236,15m\cdot s^{-1}$

$386,15m\cdot s^{-1}$

$256,15m\cdot s^{-1}$

11.

Multiple Choice

15 mins

1 pt

The siren of a stationary ambulance emits a note of frequency 1 130 Hz. When the ambulance moves at a constant speed, a stationary observer detects a frequency that is 70 Hz higher than that emitted by the siren.Calculate the speed at which the ambulance is travelling. Take the speed of sound in air as 343 m∙s-1.

$20,01m\cdot s^{-1}$

$30,01m\cdot s^{-1}$

$36,41m\cdot s^{-1}$

$10,00m\cdot s^{-1}$

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