What does the Doppler Effect describe?
a) Change in wavelength due to the motion of the observer
b) Change in the frequency of sound due to motion of the source
c) Change in the velocity of light due to motion of the observer
d) Change in the color of light due to motion of the source
When the source of sound is moving towards the observer, what happens to the frequency?
a) The frequency decreases
b) The frequency increases
c) The frequency remains constant
d) The frequency becomes zero
If the observer is moving away from the sound source, what is the observed frequency?
a) It increases
b) It decreases
c) It remains the same
d) It becomes zero
The Doppler Effect is observed for which types of waves?
a) Only sound waves
b) Only light waves
c) Both sound and light waves
d) Only mechanical waves
What happens to the wavelength of sound waves when the source is moving towards the observer?
a) The wavelength increases
b) The wavelength decreases
c) The wavelength remains constant
d) The wavelength becomes zero
Which of the following causes the Doppler Effect?
a) The motion of the observer
b) The motion of the source
c) The motion of both the source and the observer
d) The change in the medium of the wave
What is the result of the Doppler Effect in terms of sound when the source is moving away from the observer?
a) The pitch becomes higher
b) The pitch becomes lower
c) The sound becomes louder
d) There is no sound
In the case of light waves, what is the term used when the frequency shifts towards the red end of the spectrum?
a) Blue shift
b) Red shift
c) Green shift
d) Yellow shift
What is the term for the Doppler Effect observed with light waves?
a) Gravitational wave shift
b) Red shift and blue shift
c) Frequency shift
d) Sound shift
When does the Doppler Effect not occur?
a) When the source and observer are moving towards each other
b) When the observer is stationary
c) When the source and observer are not in motion
d) When the source is at rest
What does a positive Doppler shift in the case of light waves indicate?
a) The source is moving away from the observer
b) The source is moving towards the observer
c) The observer is moving towards the source
d) The wavelength is becoming shorter
What is the effect of the Doppler shift on the pitch of a sound when the source is moving towards the observer?
a) The pitch decreases
b) The pitch increases
c) The pitch remains unchanged
d) The pitch becomes constant
In which of the following situations would the Doppler Effect not produce any change in frequency?
a) The source is stationary, and the observer is moving
b) The source is moving away from the observer
c) The observer and the source are moving at equal speeds towards each other
d) The source and the observer are stationary relative to each other
What happens to the sound when a moving vehicle honks its horn as it approaches you?
a) The sound gets louder but does not change pitch
b) The pitch decreases as the vehicle approaches
c) The pitch increases as the vehicle approaches
d) The frequency stays constant
What happens to the frequency of a sound as the observer moves towards the stationary source?
a) It decreases
b) It increases
c) It remains constant
d) It is irrelevant to the motion of the observer
What is the primary effect of the Doppler shift in astronomy?
a) It helps in determining the temperature of stars
b) It allows for the measurement of star brightness
c) It helps to determine the movement of stars and galaxies relative to Earth
d) It measures the density of planets
If a source of sound is stationary and an observer is moving towards it, what happens to the observed frequency?
a) The frequency increases
b) The frequency decreases
c) The frequency stays the same
d) The frequency becomes zero
In the case of a moving sound source, which of the following changes are observed by an observer stationary at a fixed position?
a) Frequency of sound remains constant
b) Frequency of sound increases when the source approaches
c) Wavelength remains constant
d) Frequency of sound decreases when the source approaches
What is the effect of the Doppler shift when the source and observer are moving away from each other?
a) The frequency increases
b) The frequency decreases
c) The wavelength decreases
d) There is no effect on the frequency
What does the Doppler Effect tell us about a star that shows a red shift in its spectrum?
a) The star is moving towards the Earth
b) The star is moving away from the Earth
c) The star is stationary relative to the Earth
d) The star is about to explode
What is the cause of the Doppler Effect in light waves?
a) Change in the wavelength of light as the source moves
b) Refraction of light waves
c) Reflection of light from the surface
d) Dispersion of light waves
Which of the following phenomena is a direct application of the Doppler Effect?
a) Echo
b) Radar gun speed measurement
c) Light refraction
d) Interference of light
What does a blue shift in light waves indicate?
a) The source is moving away from the observer
b) The source is moving towards the observer
c) The observer is moving away from the source
d) The wavelength has no change
What happens to the wavelength of light when a source moves away from the observer?
a) The wavelength decreases
b) The wavelength increases
c) The wavelength remains unchanged
d) The wavelength becomes zero
What is the effect of the Doppler shift in sound waves on the perceived pitch as the source moves away from the observer?
a) The pitch increases
b) The pitch decreases
c) The pitch remains unchanged
d) There is no sound heard
Which wave phenomenon does the Doppler Effect most closely relate to?
a) Reflection
b) Diffraction
c) Interference
d) Wave frequency shift
In the context of the Doppler Effect, what does the term “approaching” refer to?
a) When the source and observer are moving closer together
b) When the observer is moving away from the source
c) When the source is stationary
d) When the frequency remains constant
Which of the following scenarios would show the maximum Doppler shift?
a) The source and observer are stationary
b) The observer is moving directly away from the source
c) The source is moving directly towards the observer
d) The observer is moving at an angle to the source
