What this practice covers
These questions are drawn from past CIE 0625 Physics papers and filtered to electromagnetic spectrum. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
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What examiners see students get wrong here
These are the errors that cost marks on electromagnetic spectrum, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Reciting the spectrum in the wrong order, or reversing wavelength and frequency.
- Saying different electromagnetic waves travel at different speeds in a vacuum; they do not, though they do in glass.
- Saying electromagnetic waves need a medium.
- Calling any of them longitudinal.
- Saying microwaves are ionising; only X-rays and gamma rays are, in this syllabus.
- Confusing ultraviolet with infrared when listing hazards.
- Saying a digital signal travels faster than an analogue one; it carries more information more reliably, at the same wave speed.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Electromagnetic spectrum revision notes.