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.
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.
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].
