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2 marksSound

CSEC Physics · 1997 · Paper 2 · Question 3(a)(iv)

The scale diagram, Figure 7, shows plane wavefronts incident on a barrier which has a narrow gap in it.

On Figure 8, show what happens when the gap in the barrier is wider.

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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(b)(i)Explain the term 'constructive interference'.[1 mark]
  5. 3(b)(ii)Mark, with the letter C, TWO places on Figure 9 where constructive interference is taking place.[2 marks]
  6. 3(b)(iii)Explain the term 'destructive interference'.[1 mark]
  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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