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2 marksSound

CSEC Physics · 1989 · Paper 2 · Question 5(d)(iii)

A low voltage alternating supply, a graph of which is shown in Figure 7(a), is connected to a loud-speaker and a sound is heard.

On the axes of Figure 7(c) on page 12, draw another graph to show how the applied voltage would vary with time if the sound were higher in pitch than that represented in Figure 7(a), but of the same loudness.

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Other parts of this question

  1. 5(a)Complete the figure by putting in the polarity of EACH of the magnets, and marking the field direction in the four blank spaces.[3 marks]
  2. 5(b)(i)Insert the magnetic field lines in the arrangement showing a wire placed between N and S poles of a magnet, carrying a conventional current down into the paper.[3 marks]
  3. 5(b)(ii)Insert the magnetic field lines in the arrangement showing a soft iron ring placed between two magnets.[2 marks]
  4. 5(c)(i)An ordinary torch battery is connected to a moving coil loudspeaker. State how the coil will move.[1 mark]
  5. 5(c)(ii)What would you expect to hear?[1 mark]
  6. 5(d)(i)What is the frequency of the sound that is heard?[2 marks]
  7. 5(d)(ii)On the axes of Figure 7(b) on page 12, draw a graph to show how the applied voltage would vary with time if the sound were louder than that represented in…[2 marks]

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