How long will a sound wave take to travel 1.5km, which has a frequency of 5 kHz and wavelength of 6 cm?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 5 seconds.
We use the formula Speed = Frequency × Wavelength.
Given:
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Frequency (f) = 5 kHz = 5 × 10³ Hz
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Wavelength (λ) = 6 cm = 0.06 m
So, Speed (v) = f × λ = (5 × 10³) × 0.06 = 300 m/s
Time taken (t) = Distance / Speed = 1500 m / 300 m/s = 5 seconds
Thus, the sound wave will take 5 seconds to travel 1.5 km.