1) The recieving aerial for a UHF television is about 25cm long. This is one half of the wavelength of the transmission. Calculate the frequency of the transmission.
2) Two fishing floats, a distance of 4.5m apart, bob up and down at 20 times per minute. The floats always move in antiphase. There is always at least one wave crest between the floats, but never more than two.
a) Show that the wavelength of the ripples on the river is 3m, hence find the speed of the ripples on the surface.
b) Near the bank the depth of the river halves. the speed v of water waves in shallow water of depth d is given by v= (sqaure root)gd ,where g is 9.8ms-2
i) What is the new frequency and wavelength of the waves near the bank?
ii) What is the depth of the river near the bank?
Where do I even begin?