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7 _a_ Amicrophone connected to an oscilloscope picks up the sound

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					59706059-a291-43c3-9415-c23b3e0fd232.doc                                       1/1                                                               18/02/2010


                                    PAST PAPER QUESTION: SOUND (AQA JUNE 2005)

(a) A microphone connected to an oscilloscope picks up the sound from a siren. The trace produced
on the oscilloscope screen is shown below.




Describe how the wave changes as it goes across the screen from left to right (→).

To gain full marks in this question you should write your ideas in good English. Put them into a
sensible order and use the correct scientific words.

..................................................................................................................................................................

..................................................................................................................................................................

..................................................................................................................................................................

..................................................................................................................................................................
                                                                                                                                                   (3 marks)

(b) An African bat produces a sound wave with a frequency of 212 kHz and with a wavelength of
0.0016 m.
(i) The sound made by the bat is above the limit of human hearing.
What name is given to this type of sound?


.............................................................................................................................................
                                                                                                                                                     (1 mark)

(ii) Write down the equation that links frequency, wavelength and wave speed.


.............................................................................................................................................
                                                                                                                                                     (1 mark)

(iii) Calculate the speed of this sound wave through the air. Show clearly how you work out your final
answer.




                                                                                  Wave speed = ............................ m/s                    (3 marks)

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www.cranbrook.kent.sch.uk                                                                                                       P3 – Sound and US

				
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