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Chapter 12: Q1MCQ (page 328)

Do you expect an echo to return to you more quickly on a hot day or a cold day?

(a) Hot day.

(b) Cold day.

(c) Same on both days.

Short Answer

Expert verified

The correct option is (a).

Step by step solution

01

Understanding sound’s echo

A sound produced by the reflection of sound waves from a surface back to the listener (with delay) is called an echo. The delay is directly proportional to the distance of the reflecting surface from the source and listener.

Example: The repeating of a sound created by footsteps in an empty marble hallway.

02

Explanation

Students may answer that the speed of sound is the same if they do not understand that the speed of sound is not constant but depends upon the temperature of the air. The sound rate is more significant when it is hotter, so it takes less time for the echo to return.

Hence, the correct option is (a).

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Most popular questions from this chapter

Question: (I) Estimate the number of octaves in the human audible range, 20 Hz to 20 kHz.

A musical note that is two octaves higher than a second note

(a) has twice the frequency of the second note.

(b) has four times the frequency of the second note.

(c) has twice the amplitude of the second note.

(d) is 3 dB louder than the second note.

(e) None of the above.

Question: (I) A piano tuner hears one beat every 2.0 s when trying to adjust two strings, one of which is sounding 350 Hz. How far off in frequency is the other string?

Question: (I) An organ pipe is 116 cm long. Determine the fundamental and first three audible overtones if the pipe is (a) closed at one end, and (b) open at both ends.

What evidence can you give that the speed of sound in air does not depend significantly on frequency?
See all solutions

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