A-LevelPhysicsPhysical quantities and units9702/12 · Feb/Mar 2020 · Q41 Mark

A transmitter emits a pulse of electromagnetic waves towards a reflector. The pulse is reflected and returns to the transmitter. A detector is located at the transmitter. The emitted pulse and the reflected pulse are displayed on a cathode-ray oscilloscope (CRO) as shown. [Figure showing a CRO display with two pulses marked with 1 cm separation for both amplitude and time] The pulse takes 6.3 µs to travel from the transmitter to the reflector. What is the time-base setting of the CRO?

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A2.1 µs cm¯¹

B3.2 µs cm-1

C4.2 µs cm¯¹

D6.3 µs cm¯¹

✓ Correct answer

C: 4.2 µs cm¯¹

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 4.

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