Ncert Exercises & Solutions

The displacement of the string is given by,
$y (x, t) = 0.06 \sin (\frac{2 πx}{3}) \cos (120 πt)$
where x and y are in metres and t in seconds. The length of the string is 1.5 m and its mass is $3.0 \times 10^{- 2} kg .$

(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)

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