Page 44 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020
P. 44
PHYSICS PSPM SEM 1 1999 - 2017
PSPM 2007/2008 SF017/2 No. 12(c)
14. y (cm)
2.0
0 t (s)
6
–2.0
FIGURE 10.2(a)
y (cm)
2.0
0 x (cm)
7.5
–2.0
FIGURE 10.2(b)
FIGURE 10.2(a) shows a graph of displacement, y versus time t and FIGURE 10.2(b)
shows a graph of displacement, y versus distance x of a progressive wave. From the
graphs, deduce
(a) the angular frequency. [2 m]
(b) the wave number. [2 m]
(c) the wave propagation velocity. [2 m]
(d) the particle vibrational velocity when displaced vertically 1.2 cm from the
equilibrium position.
[2 m]
(e) the displacement equation of the progressive wave. [2 m]
PSPM 2008/2009 SF017/2 No. 12(e)
-1
15. A progressive wave propagates towards positive-x direction with a velocity of 5 m s .
The amplitude and wavelength are 15 mm and 40 cm respectively.
(a) Determine the wave equation. [3 m]
(b) Calculate the vibrational speed of a particle at position x = 0.5 cm at time t = 0.2 s.
[3 m]
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