I need help with a couple of problems: A tuning fork of uknown frequency is sounded together with another tuning fork of 630 Hz. Seven beats are noted when a weight is put on the uknown tuning fork. The beat frequency is noted to increase. What is the original frequency? A cottager lying on a beach notes that in a span of 12 minutes, 57 waves crash onto the beach. She also notes that as one crest is crashing on the beach another crest is passing a boat 10m away. If there are five more crests between the two noted crests, calculate the period, wavelength, and speed of the wave. Thanks.