WorksheetsFall 2018 Doppler Effect
Total questions: 19
Worksheet time: 37mins
What is the Doppler effect?
The observed change in frequency of sound or light because of the relative motion of a wave source and the observer.
The observed change in amplitude of sound or light because of the relative motion of a wave source and the observer.
The observed change in wave speed of sound or light because of the relative motion of a wave source and the observer.
The observed change in equilibrium position of sound or light because of the relative motion of a wave source and the observer.
You stand on the sidewalk next to the street. A fire truck is moving towards 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.
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.
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 the firemen on the truck hear?
Frequency higher than 600 Hz
Frequency lower than 600 Hz
Exactly 600 Hz
No sound, silence.
You stand on the sidewalk next to the street. A fire truck is towards you. The frequency of the siren on the fire truck is 600 Hz.
What should you hear?
A higher pitch of sound.
A lower pitch of sound.
A changing sound (up and down)
No sound, silence.
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?
A higher pitch of sound.
A lower pitch of sound.
A changing sound (up and down)
No sound, silence.
Which situation will result in the highest observed frequency?
Observer moves at 20 m/s towards sound source.
Sound source is motionless.
Observer moves at 20 m/s towards sound source.
Sound source moves at 20 m/s towards the observer.
Observer is motionless.
Sound source moves at 20 m/s towards the observer.
Observer is motionless.
Sound source moves 20 m/s away from the observer.
Which situation will result in the lowest observed frequency?
Observer moves at 20 m/s towards sound source.
Sound source is motionless.
Observer moves at 20 m/s towards sound source.
Sound source moves at 20 m/s towards the observer.
Observer is motionless.
Sound source moves at 20 m/s towards the observer.
Observer is motionless.
Sound source moves 20 m/s away from the observer.
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 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
480 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?
765 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
You look at a star through a telescope. You use a special camera to measure the light being emitted from the star. The star should be a blue color, but it appears to be slightly purple.
What is the star doing?
Moving away from the Earth.
Moving towards the Earth.
Motionless in space.
Shrinking in size.
You look at a star through a telescope. You use a special camera to measure the light being emitted from the star. The star should be a yellow color, but it appears to be slightly orange.
What is the star doing?
Moving away from the Earth.
Moving towards the Earth.
Motionless in space.
Shrinking in size.
You look at a star through a telescope. You use a special camera to measure the light being emitted from the star. The star should be a red color, but it appears to be slightly orange.
What is the star doing?
Moving away from the Earth.
Moving towards the Earth.
Motionless in space.
Shrinking in size.
What is a blueshift of light waves or sound waves?
The observed frequency is higher and the wavelengths appear to be longer.
The observed frequency is higher and the wavelengths appear to be shorter.
The observed frequency is lower and the wavelengths appear to be longer.
The observed frequency is lower and the wavelengths appear to be shorter.
What is a redshift of light waves or sound waves?
The observed frequency is higher and the wavelengths appear to be longer.
The observed frequency is higher and the wavelengths appear to be shorter.
The observed frequency is lower and the wavelengths appear to be longer.
The observed frequency is lower and the wavelengths appear to be shorter.
A redshift will happen when ____ .
Wave emitting object moves towards the observer.
Wave emitting object moves away from the observer.
Wave emitting is object is stationary.
Wave emitting object moving in circles.
A blueshift will happen when ____ .
Wave emitting object moves towards the observer.
Wave emitting object moves away from the observer.
Wave emitting is object is stationary.
Wave emitting object moving in circles.
