O-LevelPhysicsElectricity5054/21 · Oct/Nov 2017 · Q64 Marks
EITHER The main part of a cathode-ray oscilloscope consists of a glass tube. At one end of the tube, electrons are emitted by a hot metal filament.
- (a)State two requirements for there to be a continuous flow of electrons in the tube. 1. 2.[2]
- (b)A microphone detects two pulses of sound. The output is displayed on the screen of an oscilloscope. Fig. 6.1 shows how the voltage output of the microphone varies with time. [Figure 6.1] Describe how the time between the two pulses can be determined using the display on the screen of the oscilloscope.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [B1] (high) positive potential
- [B1] very low gas pressure or heat filament continuously / filament must remain hot
- [M1] determine distance / number of squares between pulses
- [A1] multiply by time-base setting or multiply by number of ms / div
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