22) A sound wave has a frequency of 2 kHz and wavelength of 15 cm. How much time will it take to travel 1.5 km?
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Answer:
5 seconds
Explanation:
Velocity is wavelength times frequency.
V in cm per second is equal to 2000 Hz times 15 cm =
30000 cm per second.
Now 1km is equal to 100000 cm and 1.5 km is equal to 150000 cm. Time taken to travel is equal to distance divided by velocity which is 150000÷ 30000 =5 seconds
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