Edexcel IGCSE Physics 3.6 Frequency and Period Questions

Measure the time for one complete oscillation to find the period. Then use f = 1/T, converting the period to seconds before calculating frequency.

Exam points

determine one period from a wave trace by counting squares and applying the time-base
calculate frequency or period with f = 1/T, including ms to s and standard form values

[Maximum number: 2]

Magnetic Resonance Imaging (MRI) machines can take scans of the inside of a patient.

During the scan, music can be played through a loudspeaker to the patient.

The oscilloscope trace in the diagram represents a sound played to the patient.

Figure for Question Edexcel IGCSE Physics 3.6 Frequency and Period Questions question 1 — Edexcel IGCSE Physics

Calculate the frequency of the sound wave.

frequency = ............ Hz

Marking points:
- substitution into given equation
- evaluation

Example:
$f=\frac{1}{0.002}$ $f=500\ \mathrm{Hz}$

Accept:
- ECF from 6(b)(i)

Marking guidance:
- Deduct 1 mark for a power-of-ten error from the candidate's answer from 6(b)(i).

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Edexcel IGCSE Physics 3.6 Frequency and Period Questions question 1