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1 markSound

CSEC Physics · 1997 · Paper 2 · Question 3(b)(iii)

Two speakers, vibrating in phase, are positioned some distance apart in an open space. The crests of the waves from the speakers are shown on Figure 9.

Explain the term 'destructive interference'.

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Other parts of this question

  1. 3(a)(i)Determine the wavelength of the waves before they reach the barrier.[1 mark]
  2. 3(a)(ii)What will be the wavelength of the waves after they pass through the gap?[1 mark]
  3. 3(a)(iii)Complete Figure 7 to show what happens to the waves after passing through the gap.[2 marks]
  4. 3(a)(iv)On Figure 8, show what happens when the gap in the barrier is wider.[2 marks]
  5. 3(b)(i)Explain the term 'constructive interference'.[1 mark]
  6. 3(b)(ii)Mark, with the letter C, TWO places on Figure 9 where constructive interference is taking place.[2 marks]
  7. 3(b)(iv)Mark, with a letter D, TWO places on Figure 9 where destructive interference is occurring.[2 marks]
  8. 3(b)(v)Describe what you would expect to hear as you walk along the line, PQ.[2 marks]
  9. 3(b)(vi)If the two speakers were moved closer together, what effect would this have on what you hear as you walk along the line PQ?[1 mark]

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