Describing waves
3 marks · NormalA sound wave has a frequency of 440 Hz. Calculate the time period of this wave. Show your working.
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Show answer
0.0023 s (±0.0001)
Also accept: 2.3 \times 10^{-3} s
Common mistakes: Multiplying instead of dividing; Not using the equation T = 1/f
Show mark scheme and worked solution
Marking points
M1 · 1 mark · States or uses correct formula: T = 1/f.
M2 · 1 mark · Substitutes values correctly: 1/440.
A1 · 1 mark · Evaluates the correct answer: 0.0023 s or 2.3 × 10⁻³ s.
Worked solution
T = 1 / 440
T = 0.0023 s