Discussion
Which of the following is correct for the wavelength of sound wave ?
Answer: C
The wavelength is the distance travelled by sound per cycle.
In one complete cycle of vibration a sound wave advances by one wavelength, the distance between two successive compressions. Speed, frequency and wavelength are linked by
\[ \lambda = \frac{v}{f} \]
so in air (\(v \approx 343\) m/s) a 343 Hz tone has a wavelength of 1 m.
The number of cycles per second is the frequency, and the distance travelled per second is the speed of sound. The distance covered in two cycles is two wavelengths.
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