O-LevelPhysicsElectricity5054/11 · May/June 2010 · Q351 Mark

A cathode-ray oscilloscope is connected to an a.c. generator. A wave is seen on the screen of the oscilloscope. The speed of rotation of the generator is doubled. What is the effect on the wave?

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Anumber of peaks on the screen doubled amplitude of wave on the screen doubled

Bnumber of peaks on the screen doubled amplitude of wave on the screen same

Cnumber of peaks on the screen same amplitude of wave on the screen doubled

Dnumber of peaks on the screen same amplitude of wave on the screen same

✓ Correct answer

A: number of peaks on the screen doubled amplitude of wave on the screen doubled

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Topic: Electricity, O-Level Physics (syllabus 5054). Multiple choice, 1 mark.
Source: O-Level Physics, May/June 2010 Paper 1 Variant 1, question 35.

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