In a water tank, linear wavefronts with a frequency of 3.0 Hz are incident normally on a boundary between deep water and shallow water. In the deep water, the waves have a wavelength of 60.0 mm. In the shallow water, the waves move with a speed of 12 cms−1 .
(1) a Define the term *wavefront*.
(2) b Calculate
i the speed of the waves in the deep water.
(3) ii the wavelength of the waves in the shallow water.
(4) iii the relative refractive index of the boundary between the deep water and the shallow water.