Question

An airplane produces a sound wave with a frequency of 5 kHz and wavelength 30 m. In how much time would the sound wave cover the distance of 4 Km?

Answer 1

Answer:

Frequency, ν = 5 KHz = 5000 Hz

Wavelength, λ = 30 cm = 0.3 m

Speed, v = ν λ = 0 .3 m x 5000 Hz = 1500 m/s

Time = distance/ speed = 4000/1500 = 2.6 seconds

Answer 2

Answer:0.053s

Explanation:

Speed= wavelength x frequency

f=5*1000m

=5000m

Wavelength=30m

Speed=30*5000

=150000m/s

V=2x/t

X=4km

=4*1000m

= 4000m

t= 2x/v

= 2(4000)/150000

=0.053s

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