Describing waves
3 marks · NormalA wave has a time period of 0.02 seconds. Calculate its frequency.
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50 Hz (±1)
Common mistakes: Multiplying instead of dividing
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Marking points
M1 · 1 mark · Writes correct formula: f = 1 / T.
M1 · 1 mark · Substitutes T = 0.02 s.
A1 · 1 mark · Evaluates f = 50 Hz. (follow-through)
Worked solution
Using f = 1 / T,