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As a siren approaches an observer, the pitch of its sound seems to get
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16 Jun 2021, 08:34
16 Jun 2021, 08:34
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As a siren approaches an observer, the pitch of its sound seems to get progressively higher. As it passes the observer and moves farther away from him, its pitch seemingly descends. Why does this occur, when it is apparent that the true pitch of the siren remains constant? This effect, commonly known as the Doppler effect, is attributable to the change in frequency of the siren’s sound waves relative to the observer, and relies on the theory that sound is emitted in waves. As the siren approaches, each sound wave takes less and less time to reach the observer’s ears and as it recedes, each wave takes a longer amount of time to travel back to the observer.
Question 1
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Question Stats:
69% (01:08) correct
31% (01:35) wrong based on 42 sessions
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Consider each of the three choices separately and select all that apply.
Which of the following statements is supported by the passage?
The Doppler effect is universally accepted by physicists.
The pitch from a siren moving away from an observer seems lower than it actually is.
The Doppler effect was proposed before the advent of electric sirens.
Question 2
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Question Stats:
58% (00:56) correct
42% (00:43) wrong based on 31 sessions
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The passage provides information on each of the following except
A) what happens to the relative pitch of a sound wave as its source approaches an observer
B) what happens to the relative pitch of a sound wave as its source recedes from an observer
C) the physical property of sound necessary to produce the Doppler effect
D) whether the pitch of a sound at the observer’s location is the same as its pitch while it is approaching the observer
E) the distance from the observer at which the sound is most intense
Re: As a siren approaches an observer, the pitch of its sound seems to get
[#permalink]
16 Jun 2021, 08:47
16 Jun 2021, 08:47
1
Good one!
Q1. Which of the following statements is supported by the passage?
A. The Doppler effect is universally accepted by physicists. - Out of the scope of the passage. Nothing related to this is mentioned.
B. The pitch from a siren moving away from an observer seems lower than it actually is. - Yes. Discussed in the passage.
C. The Doppler effect was proposed before the advent of electric sirens. - Timeline is not given in the passage.
Q2. The passage provides information on each of the following except
A) what happens to the relative pitch of a sound wave as its source approaches an observer - Given in the passage.
B) what happens to the relative pitch of a sound wave as its source recedes from an observer - Given in the passage.
C) the physical property of sound necessary to produce the Doppler effect - "sound is emitted in waves." is discussed
D) whether the pitch of a sound at the observer’s location is the same as its pitch while it is approaching the observer - Given in the passage.
E) the distance from the observer at which the sound is most intense - Not discussed. Right answer
Q1. Which of the following statements is supported by the passage?
A. The Doppler effect is universally accepted by physicists. - Out of the scope of the passage. Nothing related to this is mentioned.
B. The pitch from a siren moving away from an observer seems lower than it actually is. - Yes. Discussed in the passage.
C. The Doppler effect was proposed before the advent of electric sirens. - Timeline is not given in the passage.
Q2. The passage provides information on each of the following except
A) what happens to the relative pitch of a sound wave as its source approaches an observer - Given in the passage.
B) what happens to the relative pitch of a sound wave as its source recedes from an observer - Given in the passage.
C) the physical property of sound necessary to produce the Doppler effect - "sound is emitted in waves." is discussed
D) whether the pitch of a sound at the observer’s location is the same as its pitch while it is approaching the observer - Given in the passage.
E) the distance from the observer at which the sound is most intense - Not discussed. Right answer
gmatclubot
Re: As a siren approaches an observer, the pitch of its sound seems to get [#permalink]
16 Jun 2021, 08:47
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