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Question

A sound wave has a frequency of 5kHz and wavelength of 25cm.How much distance will it travel in 5 seconds?


A

6.25 km

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B

625 m

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C

62.5 km

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D

6250 km

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Solution

The correct option is A

6.25 km


Frequency (1/T) = 5 x 10³ Hz
Wavelength (λ) = 25 cm= 0.25 m
Speed v= λ/T
v=0.25 x 5 x 10³ m/s= 1250 m/s
Speed= distance/ time

Thus, distance= speed x time= 1250 x 5 m= 6250 m= 6.25 km


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