A source of frequency 500 Hz emits waves of wavelength 0.2 m. How long does it take the wave to travel 300 m?

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3 sec

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answer is D.

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Detailed Solution

$V e l o c i t y o f w a v e = λ f = 500 \times 0.2 = 100 m / s T i m e t a k e n t o t r a v e l 300 m t = \frac{300}{v} = \frac{300}{100} = 3 s e c$

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