Question

*
A sound wave has a frequency 2kHz and wave
lungth 40um. calculate the time it takes to
drawed a distame of 1.6 km

Answer 1

Explanation:

GIVEN:

frequency = n=2kHz= 2x1000 Hz

Wavelength=lambda= 40cm=40/100=0.4m

Speed of sound:

V= frequency * wavelength

=2×1000×0.4

=800m/s

Speed=Distance/ time

Distance= 1.6km= 1.6x1000m

Time= distance/ speed

= 1.6x1000/ 800

=16×100/800

=2sec.

Therefore time required to travel 1.6km is 2sec.