3.4. Sound
A subsection of Physics, 0625, through 3. Waves
Listing 10 of 378 questions
A square wooden block is made to rotate 3000 times per minute. A springy metal strip presses against the block, as shown in . A person nearby observes what is happening. 3000 rotations / minute springy metal strip Calculate how many times per second the block rotates. number of rotations per second = Calculate the frequency of the sound caused by this arrangement. frequency = Hz State whether or not this sound could be heard by the person nearby, and give a reason for your answer.
0625_s07_qp_2
THEORY
2007
Paper 2, Variant 0
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A musical note is being produced by a loudspeaker connected to a signal generator. A person is listening to the note, as shown in . signal generator amplitude frequency By adjusting the controls on the signal generator, the amplitude and the frequency of the note from the loudspeaker can each be changed. The person moves to a position further away from the loudspeaker. State what, if anything, happens to 1. the pitch of the sound heard, 2. the loudness of the sound heard. What adjustment, if any, should be made to the two controls so that the sound heard in the new position is the same as in the original position? frequency control amplitude control shows a girl standing some distance from a rock face. She has a bell in her hand. rock face The girl rings the bell once. After a short time the sound of the bell reaches her again. Why did the sound return to her? Why was there a short time delay before the girl heard the second sound?
0625_s10_qp_21
THEORY
2010
Paper 2, Variant 1
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An electric bell hangs from flexible wires inside a glass bell-jar, as shown in . to battery electric bell bell-jar to vacuum pump When air is present in the bell-jar, the electric bell can be heard ringing clearly. What properties of sound does this observation illustrate? Tick the box alongside any appropriate answer. sound travels through air sound travels through glass sound travels faster than light sound travels infinitely fast As the vacuum pump removes the air from the bell-jar, the sound becomes quieter. Eventually the sound cannot be heard at all, even though the bell can still be seen to be working. Suggest what property of sound this observation demonstrates. illustrates a quarry where rock blasting is being carried out. P X Y Z DANGER - BLASTING An engineer at P sees the blast of an explosion at X, and after a short delay he hears two bangs separated by a very short interval. Explain why the engineer hears two bangs. The distance PX is 195 m and the short delay between seeing the blast and hearing the first bang is 0.60 s. Calculate the speed of sound. speed = m / s
0625_s13_qp_23
THEORY
2013
Paper 2, Variant 3
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Questions Discovered
378