A sound wave has a frequency of 2 kHz and wavelength 35 cm. How long will it take to travel 1.5 km?

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Solution

Speed of sound wave $v = ν λ = 2000 \times 0.35 = 700 m / s$
Distance $d = 1.5 k m = 1500 m$
Time $t = \frac{d}{v} = \frac{1500}{700} \approx 2 s$

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