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# The “Doppler effect”

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26 Nov 2014, 05:39
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The “Doppler effect” refers to the universally perceived change in the apparent pitch of a sound when that sound is approaching or receding from the listener. Specifically, whenever the distance between the listener and the source of the sound is decreasing, the sound will be perceived by the listener as higher than its true pitch; whenever that distance is increasing, the sound will be perceived by the listener as lower than its true pitch. If the distance between the listener and the source is not changing, the listener will perceive the true pitch of the sound.

If the above principle holds, which of the following should be observed as an eastward-traveling train is approached by a westward-traveling train that is blowing its horn?

A.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound lower than the true pitch.
B.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound lower than the true pitch.
C.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound higher than the true pitch.
D.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound higher than the true pitch.
E.Passengers in both trains should hear a sound that is higher than the true pitch.
[Reveal] Spoiler: OA

Last edited by Skywalker18 on 16 Apr 2017, 10:23, edited 1 time in total.

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26 Nov 2014, 05:58
D it is: Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound higher than the true pitch. --------------> people in W train will hear same pitch as they are in the train and people in E train will hear increased pitch as two train are approaching each other !!

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20 May 2016, 23:43
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15 Apr 2017, 09:30
dangngohai wrote:
The “Doppler effect” refers to the universally perceived change in the apparent pitch of a sound when that sound is approaching or receding from the listener. Specifically, whenever the distance between the listener and the source of the sound is decreasing, the sound will be perceived by the listener as higher than its true pitch; whenever that distance is increasing, the sound will be perceived by the listener as lower than its true pitch. If the distance between the listener and the source is not changing, the listener will perceive the true pitch of the sound.

If the above principle holds, which of the following should be observed as an eastward-traveling train is approached by a westward-traveling train that is blowing its horn?

Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound lower than the true pitch.
Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound lower than the true pitch.
Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound higher than the true pitch.
Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound higher than the true pitch.
Passengers in both trains should hear a sound that is higher than the true pitch.

Easy one , only D can be confirmed with the provided information.
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16 Apr 2017, 10:28
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The “Doppler effect” refers to the universally perceived change in the apparent pitch of a sound when that sound is approaching or receding from the listener. Specifically, whenever the distance between the listener and the source of the sound is decreasing, the sound will be perceived by the listener as higher than its true pitch; whenever that distance is increasing, the sound will be perceived by the listener as lower than its true pitch. If the distance between the listener and the source is not changing, the listener will perceive the true pitch of the sound.
Type - Inference
If the above principle holds, which of the following should be observed as an eastward-traveling train is approached by a westward-traveling train that is blowing its horn?

A.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound lower than the true pitch. -The source of sound is not in eastbound train and hence passengers on it will hear a different pitch
B.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound lower than the true pitch. - Since the distance between trains is decreasing, the passengers will hear a pitch higher than the true pitch
C.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound higher than the true pitch. - -The source of sound is not in eastbound train and hence passengers on it will hear a different pitch
D.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound higher than the true pitch. -Correct
E.Passengers in both trains should hear a sound that is higher than the true pitch.- The passengers on westbound train will hear the true pitch

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12 May 2017, 07:38
It is clear that

1 whenever the distance between the listener and the source of the sound is decreasing, the sound will be perceived by the listener as higher than its
true pitch

2 whenever that distance is increasing, the sound will be perceived by the listener as lower than its true pitch.

3 If the distance between the listener and the source is not changing, the listener will perceive the true pitch of the sound

A.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound lower than the true pitch. Incorrect
B.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound lower than the true pitch. Incorrect
C.Passengers in the eastbound train should hear the true pitch of the horn; passengers in the westbound train will hear a sound higher than the true pitch. Incorrect
D.Passengers in the westbound train should hear the true pitch of the horn; passengers in the eastbound train will hear a sound higher than the true pitch. Correct using point 1 and 3
E.Passengers in both trains should hear a sound that is higher than the true pitch. Incorrect.

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The “Doppler effect”   [#permalink] 12 May 2017, 07:38
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