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13. Sound
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Q17 of 47 Page 13

What frequencies are heard and produced by dogs and bats respectively?

Dogs can hear frequencies up to 40, 000 Hz while bats can produce and hear frequencies up to 70, 000 Hz.

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15 We hear sound only of its frequency is greater than ________ and lower than ________. 16 A taut membrane produces sound of ________ frequency than a loose one. 18 Pendulum A makes 14 oscillations in five seconds and pendulum B makes 10 oscillations in three seconds. Which has a higher frequency? Express the frequency of each pendulum in hertz. 19 What is the range of audible frequencies for a normal human ear? 
Questions · 47
13. Sound
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