Page 51 - SP015 Past Years PSPM Chapter 6 -14 Ver 2020

PSPM SP015

PSPM 2006/2007 SF017/2 No. 6

43. What is the length of a bottle that has a natural fundamental frequency of 440 Hz?
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(Speed of sound = 343 m s ) [3 m]

PSPM 2009/2010 SF017/2 No. 5

44.

34 cm

FIGURE 10.6
FIGURE 10.6 shows a narrow cylindrical tube filled with water and forming a 34 cm
air column. When blown at the open end, a loud sound is heard.

(a) Explain the production of the loud sound. [2 m]
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(b) Given the velocity of sound in air is 340 m s , calculate the frequency of the loud
sound. [2 m]

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

45. The first overtone standing wave is formed in a 30 cm closed pipe. Sketch the wave and
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calculate its frequency. The speed of sound is 340 m s . [3 m]

Doppler Effect

PSPM 2016/2017 SF016/2 No. 7(b)(i)

46. What is Doppler effect for sound wave? [1 m]

PSPM JUN 1999/2000 SF035/2 No. 10(b)(i)

47. When a police patrol car sounds its siren and approaches an observer at rest, the
frequency of sound heard by the observer is higher than its original frequency. Explain
this statement. [2 m]

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