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

6.25 km

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625 m

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62.5 km

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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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(1) Sound wave has frequency 320 Hz and wavelength 0.25 m. How much distance will it travel in 10 second.

[Ans : 800 m.]

(2) A sound wave having certain frequency travels with a speed of 336 m/s and wavelength 3 cm. calculate the frequency. Will it be audible?

[11200 Hz, Yes.]

10

3

3

1 k H z

25 c m

2.2 k m

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