give
exam
(b) Two plane waves of the same amplitude, wavelength and frequency are traveling in
opposite directions and meet in a certain region. (i) Find an equation for the resultant wave.
(ii) Find the values of x for which the amplitude of the resultant wave is a maximum.
(c) A wave has an amplitude of 2 cm and a frequency of 12 Hz, and the distance from a crest to
the nearest trough is measured to be 5 cm. Determine the period of such a wave.