If the wavelength of a sound wave is 40 cm and the time period T = 0.0005 s, then it takes ___ seconds to travel 4 km.

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Solution

Speed of the sound wave, v = $\frac{w a v e l e n g t h}{t i m e} = 800 m / s$

Hence, time taken to cover 4 km = $\frac{d i s t a n c e}{s p e e d} = \frac{4000}{800} = 5 s$

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