NCERT CLASS 11 WAVES EXEMPLAR SOLUTIONS DOWNLOAD PDF

A transverse harmonic wave on a string is described by y (x,t) =

3.0 sin (36t + 0.018x + π/4)

where x and y are in cm and t is in s. The positive direction of x is

from left to right.

(a) The wave is travelling from right to left.

(b) The speed of the wave is 20m/s.

(d) The least distance between two successive crests in the wave

is 2.5 cm.

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15:35 In the given progressive wave

y = 5 sin (100πt – 0.4πx )

where y and x are in m, t is in s. What is the

(a) amplitude

(b) wave length

(d) wave velocity

(e) particle velocity amplitude

For the harmonic travelling wave y = 2 cos 2π (10t–0.0080x + 3.5)

where x and y are in cm and t is second. What is the phase

difference between the oscillatory motion at two points separated

by a distance of

(a) 4 m

(b) 0.5 m

(d)3λ/4

(at a given instant of time)

(e) What is the phase difference between the oscillation of a

particle located at x = 100cm, at t = T s and t = 5 s

15:10 For the travelling harmonic wave

y(x, t) = 2.0 cos 2π (10t – 0.0080 x + 0.35)

where x and y are in cm and t in s. Calculate the phase difference between oscillatory

motion of two points separated by a distance of

(a) 4 m,

(b) 0.5 m,

(d) 3λ/4

15:10

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