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8 marksProperties of Waves

CAPE Physics Unit 1 · 2004 · Paper 2 · Question 6(c)(i)

Figure 5 shows two loudspeakers S₁ and S₂ separated by 0.50 m. They are connected to an amplifier, forming sound waves with the same amplitude at 4400 Hz. The amplifier emits two waves 180° out of phase. Chairs are arranged in a semicircle 30.0 m from the speakers. Speed of sound in air = 330 m s⁻¹.

Calculate the amplitude of the wave at the chair on the perpendicular bisector (centre line) of the line between the speakers.

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Other parts of this question

  1. 6(a)(i)Explain what is meant by 'refraction of sound waves'.[8 marks]
  2. 6(a)(ii)Draw sketches to show the refraction of sound waves as the waves travel from cool air to warmer air and from warm air to cooler air.[1 mark]
  3. 6(a)(iii)Hence explain why sound waves are more audible at night than in the day.[1 mark]
  4. 6(b)Using these data, calculate a value for the speed of sound in air.[4 marks]
  5. 6(c)(ii)At what MINIMUM distance, D, to the right of this central chair is there a MAXIMUM in the sound intensity?[1 mark]

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