Page 47 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

Superposition of Wave ~ Standing Wave

PSPM 2016/2017 SF016/2 No. 7(a)

22. Explain the formation of stationary wave. [2 m]

PSPM JUN 1999/2000 SF035/2 No. 2(b)

23. Displacement equation of a stationary wave is given by

y = 3 sin (100t) cos (0.1x)

where y and x are in cm and t is in second. Determine the speed of this wave. [3 m]

PSPM 2007/2008 SF017/2 No. 5

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24. The velocity of a stationary wave on a string is 300 m s . If the frequency of the wave
is 100 Hz, what is the distance between two successive nodes? [3 m]

PSPM 2008/2009 SF017/2 No. 5

25. The following waves are superposed;

y 1 (x, t) = 6 sin (2t – 3x)

y 2 (x, t) = 6 sin (2t + 3x)
(a) What type of wave is formed? [1 m]
(b) Derive the equation of the resulting wave. [3 m]

Sound Intensity

PSPM 2013/2014 SF016/2 No. 7(c)(i)

26. Define sound intensity. [1 m]

PSPM 2010/2011 SF017/2 No. 12(b)(ii)

27. How does the intensity of sound change with the sound wave amplitude, A and distance,
r from its source? [2 m]

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