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2 marksProperties of Waves

CAPE Physics Unit 1 · 2008 · Paper 2 · Question 2(b)(iii)

Two vertical dipole antennas, A and B, emit coherent signals from a radio station broadcasting at a frequency of 900 kHz. The antennas are spaced 600 m apart, as shown in Figure 2. A maximum intensity is received at P on the line perpendicular to AB, and the next maximum is detected at R at an angle θ.

At what angle to the mid-line would the next minimum of the interference pattern occur?

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Other parts of this question

  1. 2(a)(i)What is meant by the term 'diffraction'?[1 mark]
  2. 2(a)(ii)Show on the diagram, the resulting waves after passage through the slits.[2 marks]
  3. 2(a)(iii)Mark on Figure 1, TWO places where constructive interference occurs and TWO places where destructive interference occurs. (Use a circle O for constructive…[2 marks]
  4. 2(a)(iv)In the space below draw wave diagrams to show how TWO waves could superpose to produce constructive and destructive interference.[2 marks]
  5. 2(b)(i)Calculate the value of θ.[5 marks]
  6. 2(b)(ii)Explain why at Q, a point midway between P and R, the signal received is very weak.[1 mark]

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