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4. It takes sound waves of frequency 500 Hz 14.7 ms to make a round trip through a hollow pipe of length 7.5 m filled with helium. What is the speed of sound in helium? Show your calculations 5. The speed of sound waves in air is 343 m/sec. If the frequency of the waves is 450 Hz, what are the period and wavelength of the waves? wavelength of this sound?
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-450 Hz 5 ג - 343 L. - 0.16 2 m q6:- sound maur, ナニ343m/s チー 500 Hz 0,6&6 m 500

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