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.
(c) Frequency of the wave is 5.7 Hz.
(d) The least distance between two successive crests in the wave
is 2.5 cm.
15:11
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
(c) frequency
(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
(c) λ/2
(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,
(c) λ/2,
(d) 3λ/4
15:10
