An acoustic sensor embedded in an ice sheet sends a sound pulse through the ice into seawater below.
The table gives data for the sound pulse.
| Medium | Speed in m/s\mathrm{m/s}m/s | Wavelength in m\mathrm{m}m |
|---|---|---|
| Ice | 3800 | 0.076 |
| Seawater | 1500 | -- |
The sound pulse reaches the boundary at an angle to the normal.
Calculate the wavelength of the sound pulse in seawater.
Explain how the direction of the sound pulse changes as it enters the seawater.