If 20 sound waves pass throw a Point in a medium in 2 s with the velocity of 20 m/s, then the wavelength will be
Correct answer: B. 2m
- A. 1m
- B. 2m
- C. 10m
- D. 20m
Explanation
To find the wavelength (λ), use the formula λ = v/f, where v is the velocity of the wave and f is the frequency. First, calculate the frequency: 20 sound waves in 2 seconds means a frequency (f) of 10 Hz (20 waves / 2 s). Given the velocity (v) is 20 m/s, plug in the values: λ = 20 m/s / 10 Hz = 2 m. Thus, the correct wavelength is 2 meters. The other options result from incorrect calculations of frequency or misunderstandings of the wave relationship.
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About Wave Speed
Wave speed is the rate at which a disturbance or wave pattern travels through a medium, given by v = fλ, where f is frequency and λ is wavelength. Questions examine how speed changes between media, the relation among frequency, wavelength and period, and why wave speed is not the same as particle vibration speed.
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