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2 marksSound

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

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(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 7(a), but of the same frequency.

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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)(iii)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…[2 marks]

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