MHT CET · Physics · Waves and Sound
An observer on sea-coast counts 45 waves in one minute. If the wavelength of the waves is 7 m , then the velocity of the waves will be
- A \(4.75 \mathrm{~m} / \mathrm{s}\)
- B \(5.25 \mathrm{~m} / \mathrm{s}\)
- C \(7.5 \mathrm{~m} / \mathrm{s}\)
- D \(8.65 \mathrm{~m} / \mathrm{s}\)
Answer & Solution
Correct Answer
(B) \(5.25 \mathrm{~m} / \mathrm{s}\)
Step-by-step Solution
Detailed explanation
\(f = \frac{45}{60 \text{ s}} = 0.75 \text{ Hz}\) \(v = f \lambda = (0.75 \text{ Hz})(7 \text{ m}) = 5.25 \text{ m/s}\)
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