The Wavelength of Tsunamis in Midocean Is on the Order

Multiple Choice

The wavelength of tsunamis in midocean is on the order of several hundred miles. The speed of tsunami waves where the ocean is a few miles deep is on the order of the speed of sound in air. As the wave approaches land, its amplitude must

A) increase modestly.
B) increase dramatically.
C) decrease modestly.
D) decrease dramatically.