A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2016 · Q41 Mark

The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel. [Figure 4.1] The flywheel has a small magnet M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10 cm wide. The flywheel is rotating at 3000 revolutions per minute. Which time-base setting will display clearly separate pulses on the screen?

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A1 s cm⁻¹

B10 ms cm⁻¹

C100 µs cm⁻¹

D1 µs cm⁻¹

✓ Correct answer

B: 10 ms cm⁻¹

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2016 Paper 1 Variant 2, question 4.

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