The displacement of the string is given by,
where x and y are in metres and t in seconds. The length of the string is 1.5 m and its mass is
(a) It represents a progressive wave of frequency 60 Hz.
(b) It represents a stationary wave of frequency 60 Hz.
(c) It is the result of a superposition of two waves of wavelength 3 m, frequency 60 Hz each travelling with a speed of 180 m/s in the opposite direction.
(d) The amplitude of this wave is constant.
Choose the correct alternatives:
1. (b, d)
2. (a, c)
3. (b, c)
4. (c, d)