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Class 10 > what is Doppler's effect ? how it is different from...
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what is Doppler's effect ? how it is different from echo ?

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Professional Tutor with 15 years of experience.

The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. You hear the high pitch of the siren of the approaching ambulance, and notice that its pitch drops suddenly as the ambulance passes you.
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Mathematics for class V-X

The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source.
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The phenomenon of an apparent change in the frequency of sound due to the relative motion between the source of sound and the observer is called Doppler Effect. Doppler effect is not observed whenever there is no relative velocity between the source and the observer.
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It is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an...
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It is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding. It is important to note that the effect does not result because of an actual change in the frequency of the source. Using the example above, the bug is still producing disturbances at a rate of 2 disturbances per second; it just appears to the observer whom the bug is approaching that the disturbances are being produced at a frequency greater than 2 disturbances/second. The effect is only observed because the distance between observer B and the bug is decreasing and the distance between observer A and the bug is increasing. The Doppler effect can be observed for any type of wave - water wave, sound wave, light wave, etc. We are most familiar with the Doppler effect because of our experiences with sound waves. Perhaps you recall an instance in which a police car or emergency vehicle was traveling towards you on the highway. As the car approached with its siren blasting, the pitch of the siren sound (a measure of the siren's frequency) was high; and then suddenly after the car passed by, the pitch of the siren sound was low. That was the Doppler effect - an apparent shift in frequency for a sound wave produced by a moving source. read less
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present for both light and sound
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Physicist

when the source moves the relative speed of sound changes hence the frequency of the sound ( with velocity , wavelength changes which in turn changes frequency). This is doppler effect in sound. In echo, sound reflects from a surface which is at least 75 m away. (this distance is calculated according...
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when the source moves the relative speed of sound changes hence the frequency of the sound ( with velocity , wavelength changes which in turn changes frequency). This is doppler effect in sound. In echo, sound reflects from a surface which is at least 75 m away. (this distance is calculated according to Human's hearing efficiency). Human can hear their reflected sound commonly known as echo. read less
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Robotics and Artificial Intelligence Trainer With 5+ Years of Experience

an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren.....and Echo is nothing but a sound or sounds caused by the reflection of sound waves...
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an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren.....and Echo is nothing but a sound or sounds caused by the reflection of sound waves from a surface back to the listener read less
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The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an...
read more
The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding. It is important to note that the effect does not result because of an actual change in the frequency of the source. Using the example above, the bug is still producing disturbances at a rate of 2 disturbances per second; it just appears to the observer whom the bug is approaching that the disturbances are being produced at a frequency greater than 2 disturbances/second. The effect is only observed because the distance between observer B and the bug is decreasing and the distance between observer A and the bug is increasing. The Doppler effect can be observed for any type of wave - water wave, sound wave, light wave, etc. We are most familiar with the Doppler effect because of our experiences with sound waves. Perhaps you recall an instance in which a police car or emergency vehicle was traveling towards you on the highway. As the car approached with its siren blasting, the pitch of the siren sound (a measure of the siren's frequency) was high; and then suddenly after the car passed by, the pitch of the siren sound was low. That was the Doppler effect - an apparent shift in frequency for a sound wave produced by a moving source. read less
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