A sound wave travels from air into water.
How do its speed and wavelength change?
Show answer & explanation
Correct answer: C
Explanation
The speed of sound depends on the medium.
The speed of sound in air is approximately 343 m/s, while in water it is approximately 1480 m/s.
The speed increases.
The frequency remains the same as the wave travels from one medium to another.
Wavelength is related to speed and frequency:
Where v = speed, f = frequency.
Since v increases and f remains the same, λ increases.
Therefore, sound travels faster and with a longer wavelength in water.