Worksheetsdoppler effect matriculation
Total questions: 30
Worksheet time: 1hrs 19mins
The Doppler effect is seen when a wave-making source moves toward an observer.
True
False
What is the Doppler Effect?
A change in frequency due to the relative motion of a wave source and an observer
When a wave overlaps with another wave
When a wave bounces off of another object
When a wave bends due to traveling through a different medium
You stand on the sidewalk next to the street. A fire truck is away from you. The frequency of the siren on the fire truck is 600 Hz.
What should you hear?
Frequency higher than 600 Hz
Frequency lower than 600 Hz
Exactly 600 Hz
No sound, silence.
A siren is generating a wave with a frequency of 10Hz while moving. An observer uses a wave detector and measures the frequency as 5Hz. What can you conclude about the motion of the siren?
The siren is moving towards the observer because the wavelength is shorter
The siren is moving away from the observer because the amplitude is lower
The siren is moving towards the observer because the frequency is lower
The siren is moving away from the observer because the frequency is lower
What can you tell about the motion of this object?
Moving left.
Moving right quickly.
Standing still.
Moving up slowly.
An am ambulance travelling at 30m/s sounds a siren (400 Hz). Speed of sound is 330 m/s. Calculate the frequency heard when it is moving away from the observer.
463 Hz
440 Hz
400 Hz
367 Hz
A car moving at 30 m/s honks its horn (500 Hz). If the speed of sound is 340 m/s, what frequency is perceived by a stationary observer as the car approaches?
600 Hz
500 Hz
548 Hz
400 Hz
A train moving at 40 m/s blows its whistle (600 Hz). If the speed of sound is 340 m/s, what frequency is perceived by a stationary observer as the train approaches?
700 Hz
600 Hz
680 Hz
560 Hz
A car traveling at 30 m/s honks its horn (500 Hz). If the speed of sound is 340 m/s, what frequency is perceived by a stationary observer as the car approaches?
550 Hz
548 Hz
480 Hz
460 Hz
A train moving at 50 m/s blows its horn (600 Hz). If the speed of sound is 340 m/s, what frequency is heard by an observer when the train is approaching?
680 Hz
600 Hz
550 Hz
520 Hz
A car is traveling at 20 m/s towards a stationary siren. The siren emits a sound with a frequency of 500 Hz. The speed of sound in air is 340 m/s.
What frequency is perceived by the passengers in the car?
550 Hz
480 Hz
500 Hz
520 Hz
A train is moving at 30 m/s towards a stationary bell. The bell produces a sound with a frequency of 600 Hz. The speed of sound in air is 340 m/s.
What frequency is perceived by the passengers on the train?
650 Hz
653 Hz
620 Hz
600 Hz
A car moves at 20 m/s towards a whistle. The whistle is stationary. The whistle makes a sound with a frequency of 500 Hz. The speed of sound in air is 330 m/s.
What is the frequency observed by the driver of the car?
530 Hz
470 Hz
520 Hz
480 Hz
A train is moving at 30 m/s towards a stationary bell. The bell produces a sound with a frequency of 600 Hz. The speed of sound in air is 340 m/s.
What frequency is perceived by the passengers on the train?
650 Hz
580 Hz
620 Hz
600 Hz
The pitch of a sound wave relates to the wave's _________________.
Amplitude
Frequency
Wavelength
Period
What is the Doppler Effect?
A change in frequency due to the relative motion of a wave source and an observer
When a wave overlaps with another wave
When a wave bounces off of another object
When a wave bends due to traveling through a different medium
An ambulance is driving towards you as you stand on the sidewalk. What happens to the pitch of the siren as it comes towards you?
It increases
It decreases
You are driving in a car and honk the horn at a person standing in the street. As you approach the person, what happens to the pitch of the horn according to you in the car?
It increases
It decreases
It stays the same because you are in the car moving with the sound.
An observer passes a 500 Hz sound source and moves away with a speed of 30 ms-1. The speed of sound is 330 ms-1.
The frequency heard by the moving observer is
458.3 Hz
544 Hz
454.5 Hz
548 Hz
The speed of sound is 330 ms-1. A motorcycle moving at 45 m/s sounds its horn (250 Hz) passing by a pedestrian. What sound does the pedestrian hear when the motorcycle approaches?
203.65 Hz
456Hz
786 Hz
289.47 Hz
An am ambulance travelling at 30m/s sounds a siren (400 Hz). Speed of sound is 330 m/s. Calculate the frequency heard when it is moving towards the observer.
463 Hz
440 Hz
400 Hz
367 Hz
A fire truck is moving towards you. The fire truck moves with a speed of 30 m/s. You are motionless. The siren on the fire truck makes a sound with a frequency of 700 Hz. The speed of sound in air is 350 m/s.
What frequency will you hear?
766 Hz
730 Hz
660 Hz
645 Hz
A fire truck is moving away from you. The fire truck moves with a speed of 30 m/s. You are motionless. The siren on the fire truck makes a sound with a frequency of 700 Hz. The speed of sound in air is 350 m/s.
What frequency will you hear?
765 Hz
730 Hz
660 Hz
645 Hz
A car moves at 20 m/s towards a whistle. The whistle is stationary. The whistle makes a sound with a frequency of 500 Hz. The speed of sound in air is 330 m/s.
What is the frequency observed by the driver of the car?
530 Hz
470 Hz
480 Hz
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
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
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
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
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⋅s−1
30,01m⋅s−1
36,41m⋅s−1
10,00m⋅s−1
A car moves at 20 m/s away from a whistle. The whistle is stationary. The whistle makes a sound with a frequency of 500 Hz. The speed of sound in air is 330 m/s.
What is the frequency observed by the driver of the car?
530 Hz
470 Hz
520 Hz
469.7
