Question
Which process causes a sound wave to produce an echo?
A diffraction
B dispersion
C reflection
D refraction
Answer/Explanation
Ans: C
Question
A quiet sound is produced by a loudspeaker. The pitch of the sound remains constant but the loudness of the sound is increased.
Which property of the sound wave is increased?
A amplitude
B frequency
C speed
D wavelength
Answer/Explanation
Ans: A
Question
The diagrams represent the waves produced by four sources of sound. The scales are the same for all the diagrams.
Which sound has the highest frequency?
Answer/Explanation
Ans: D
Question
A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is
reflected from the sea-bed. The sound reaches the boat again after 1.3 s. The sea-bed is 1000 m below the boat.
Using this information, what is the speed of sound in the water?
A 770 m / s B 1300 m / s C 1500 m / s D 2600 m / s
Answer/Explanation
Ans: C
Question
A pulse of sound is produced at the bottom of a boat. The sound travels through the water and is
reflected from a shoal of fish. The sound reaches the boat again after 1.2 s. The speed of sound
in the water is 1500 m / s.
How far below the bottom of the boat is the shoal of fish?
A 450 m
B 900 m
C 1800 m
D 3600 m
Answer/Explanation
Ans: B