Ncert Exercises & Solutions

Professor CV Raman surprised his students by suspending freely a tiny light ball in a transparent vacuum chamber by shining a laser beam on it. Which property of EM waves was he exhibiting? Give one more example of this property.

Hint: The electromagnetic waves transferred the energy to the ball.

An electromagnetic wave carries energy and momentum like other waves.
Since it carries momentum, an electromagnetic wave also exerts pressure called radiation pressure. This property of electromagnetic waves helped professor CV Raman surprised his students by suspending a freely tiny light ball in a transparent vacuum chamber by shining a laser beam on it. The tails of the comets are also due to radiation pressure.

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