Three and four mark questions

These are similar to one and two mark questions but you will be expected to write in more depth for three and four mark questions.

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Three and four mark questions usually require longer answers.

Sample question 1 - Foundation and Higher

Question

A microphone connected to an oscilloscope picks up the sound from a siren. The trace produced on the oscilloscope screen is shown below.

A green oscilloscope screen with a line that sharply curves up and down near the start and steadies itself to a gradual curve near the end.

Describe how the wave changes as it goes across the screen from left to right. [3 marks]

An Edexcel question courtesy of Pearson Education Ltd.

The amplitude is decreasing [1], the wavelength is increasing [1] so the frequency is decreasing [1].