Question

1. When light passes from an unknown material into air it bends away from the normal. For a certain ray, the angle of incidence is 43 degrees but the refracted ray is perpendicular to the normal. How fast does light travel in the unknown material? Answer in km/s

2.During a halftime show, a flute player marches behind tuba player. Although both players are marching in the same direction, the (very swift) flute player marches at 21.1 m/s while tuba player is only moving at 3.3 m/s. The flute player is playing an 'A' which is 440 Hz. Determine the frequency of the flute heard by the tuba player. Assume that the speed of sound is 338 m/s.

Answer 1