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.

Three and four mark questions usually require longer answers.

Sample question 1 - Foundation and Higher


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].