A sound wave has a frequency of 1 kHz and wavelength 50 cm. How long will it take to travel 1 km?
5 s
4 s
3 s
2 s
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2022
– Given frequency f = 1 kHz = 1000 Hz.
– Given wavelength λ = 50 cm = 0.50 m.
– Velocity v = (1000 Hz) × (0.50 m) = 500 m/s.
– Distance to be travelled = 1 km = 1000 m.
– Time taken (t) = Distance / Velocity.
– t = 1000 m / 500 m/s = 2 seconds.