Question

a sound wave has a frequency of 2Hz and wave length 40 cm. how long will take to travel 1.6 km

Answer 1

GIVEN:

frequency( n) =2kHz= 2 x 1000 Hz= 200Hz

[ 1kHz = 1000 Hz]

Wavelength(λ) = 40cm=40/100=0.4m

[ 1cm = 1/100 m]

Distance= 1.6km= 1.6x1000m = 1600 m

[1km = 1000 m]

Speed of sound(V)= frequency× wavelength

V =2000×0.4

V=800m/s

Speed=Distance/ time

Time= distance/ speed

Time = 1600/ 800

Time =2sec.

Hence, the time required to travel 1.6km is 2sec.

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