Ncert Exercises & Solutions

15.12 (i) For the wave on a string described in Exercise 15.11, do all the points on the string oscillate with the same (a) frequency, (b) phase, (c) amplitude? Explain your answers. (ii) What is the amplitude of a point 0.375 m away from one end?

(i) All the points on the string oscillate with the same frequency, except at the nodes which have zero frequency.

All the points in any vibrating loop have the same phase, except at the nodes.
All the points in any vibrating loop have different amplitudes of vibration.
The given equation:

$y (x, t) = 0.06 \sin (\frac{2 π}{3} x) \cos (120 πt)$
$For x = 0.375 m and t = 0$
$Amplitude = 0.06 \sin (\frac{2 π}{3} x)$
$= 0.06 \sin (\frac{2 π}{3} \times 0.375)$
$= 0.06 \sin (0.25 π) = 0.06 \sin (\frac{π}{4})$
$= 0.06 \times \frac{1}{\sqrt{2}} = 0.042 m$

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