1.

A sound wave hos frequency 2 ikhz and wweiength 40 cm ina sven medium.Calculate the tme taken by 1t to travel 1.6 kmin a given medium.

Answer»

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= 1.6 km= 1.6x1000 m

Time= distance/ speed

= 1.6x1000/ 800

=16×100/800

=2sec

Therefore time required to travel 1.6km is 2 sec.



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