Question

A sound wave (a periodic longitudinal wave) from a loudspeaker travels from air into water. The frequency of the wave does not change, because the loudspeaker producing the sound determines the frequency. The speed of sound in air is 343 m/s, whereas the speed in fresh water is 1482 m/s. When the sound wave enters the water, does its wavelength increase, decrease, or remain the same

Answer 1

Answer:

When the sound wave enters the water its wavelength increase.

Explanation:

Given:

Speed of sound in air $v = 343 \frac{m}{s}$

Speed of sound in fresh water $v' = 1482 \frac{m}{s}$

We know that when wave travel into one medium to another medium frequency doesn't change.

Velocity is given by,

  $v = f \lambda$

In above equation frequency is constant,

So when sound wave enters the water wavelength increase because speed sound is increase in water as compare to air.

Therefore, when the sound wave enters the water its wavelength increase.