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Physics (AS & A Level) · Feb / March 2018 · Paper 12 · Question 25

9702Progressive waves

The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. The time base setting is 0.20 µs cm⁻¹. Which statement is correct?

  1. AThe frequency of the wave is 2.5 MHz and it lies in the microwave region of the electromagnetic spectrum.
  2. BThe frequency of the wave is 2.5 MHz and it lies in the radio-wave region of the electromagnetic spectrum.
  3. CThe frequency of the wave is 5.0 MHz and it lies in the microwave region of the electromagnetic spectrum.
  4. DThe frequency of the wave is 5.0 MHz and it lies in the radio-wave region of the electromagnetic spectrum.

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Correct answer: B. The frequency of the wave is 2.5 MHz and it lies in the radio-wave region of the electromagnetic spectrum.

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