Tutopiya: Study Resources for IGCSE, IB, GCSE & A-Levels

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5 MCQs

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1
All electromagnetic waves are:
Answer & explanation
Correct: option B
EM waves consist of electric and magnetic field oscillations perpendicular to the direction of travel — that makes them transverse.
2
What is the speed of all EM waves in a vacuum?
Answer & explanation
Correct: option C
All EM waves travel at $c = 3 \times 10^8$ m/s in a vacuum.
3
Which group of the EM spectrum has the longest wavelength?
Answer & explanation
Correct: option D
Radio waves have the longest wavelength (metres to kilometres) and the lowest frequency.
4
Which is correct about visible light?
Answer & explanation
Correct: option C
Visible light is a small slice of the EM spectrum with wavelengths roughly 400 nm (violet) to 700 nm (red).
5
Which of these is generated by changes in the nucleus of an atom?
Answer & explanation
Correct: option D
Gamma rays come from nuclear changes (radioactive decay). The other groups originate in electron or current processes outside the nucleus.