Discussion
Which one of the following proves the transverse nature of electromagnetic waves?
Answer: C
The transverse nature is shown by polarization of light.
Only a transverse wave has a direction of vibration at right angles to the direction of travel, and that direction can be filtered. A polaroid passes light vibrating in one plane; two crossed polaroids block it completely. A longitudinal wave, vibrating along its direction of travel, could not be polarized this way.
Interference and diffraction show that light is a wave, but longitudinal waves such as sound interfere and diffract too. Dispersion shows that the speed depends on wavelength. The photoelectric effect shows the particle (photon) nature of light.
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