## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

(a) The frequency of a wave does not change when it travels from one medium into another medium. Therefore, the frequency in the water is 440 Hz. (b) The speed of sound in water is 1500 m/s. We can find the wavelength in the water. $\lambda = \frac{v}{f}$ $\lambda = \frac{1500~m/s}{440~Hz}$ $\lambda = 3.4~m$ The wavelength in the water is 3.4 m.