Describe the Doppler Effect.
Solution
The Doppler Effect, also known as Doppler shift, is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842.
Here are the steps to describe the Doppler Effect:
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Consider a wave source and an observer. The wave could be light, sound, or any other type of wave. The source and observer could be stationary or moving relative to each other.
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If the source and observer are stationary relative to each other, the observer perceives the wave at the same frequency as it is emitted by the source. This is because the distance between the source and observer is not changing.
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If the source is moving towards the observer, the observer perceives the wave at a higher frequency than it is emitted by the source. This is because the distance between the source and observer is decreasing, so the waves are compressed and the frequency appears higher.
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If the source is moving away from the observer, the observer perceives the wave at a lower frequency than it is emitted by the source. This is because the distance between the source and observer is increasing, so the waves are stretched and the frequency appears lower.
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The same principles apply if the observer is moving instead of the source. If the observer is moving towards the source, they perceive a higher frequency, and if they are moving away from the source, they perceive a lower frequency.
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The Doppler Effect is observed in many phenomena. For example, it is why a car engine sounds different as it approaches and then passes by. It is also used in astronomy to determine whether stars and galaxies are moving towards or away from us.
Similar Questions
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When a source of sound and an observe are in relative motion, the pitch of sound heard by the observer is different from the original pitch delivered by the source. This phenomenon is called Doppler effect.If source of sound is stationery and observer is moving towards the source with a velocity v0 then the apparent frequency heard by the observer is given by v′ = (c + v0c)v, where v is the original frequency of source. Similarly, if observer is at rest and source is moving towards the observer with a velocity vs the apparent frequency heard by the observer is given by v′ = (cc − vs)vIf the direction of motion of observer or source is changed, the sign of velocity changes (i.e., ‘+ve’ sign changes into ‘-ve’ sign and vice-versa). (Where C = speed of sound in air = 340 m/s)An observer moves towards a stationary source of sound producing a pitch of 600 Hz with a velocity 60 ms-1. What is the apparent frequency heard by the observer if velocity of sound is 340 ms–1?
With reference to the Doppler Effect, write down an expression that relates thesound frequency fo heard by a stationary observer, when a sound source movingtowards the observer at speed vs emits a frequency fs. Also write down an expressionfor the sound frequency fo heard by an observer that is moving towards a stationarysound source at a speed vo
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