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A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by thesound wave to travel a distance of 3.2 km is:IS: |
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Answer» Here we are given the frequency as 4 kHz We know that 1 kHz = 1000 Hz So , 4kHz = 4000 Hz Frequency, f = 4000 Hz Also , Wavelength , λ = 40 cm 1 cm = 0.01 metres So , Wavelength , λ = 0.40 metres We know that 1 kilometre = 1000 metres So ,3.2 kilometre = 3200 metres We know that ,Velocity = frequency x Wavelength = 4000 x 0.40 = 1600 m/s Also , Time = Distance/Velocity = 3200 / 1600 = 2 s |
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