Q.

Which of the following waves cannot be polarized?

A. Radio
B. Ultra violet
C. Infrared
D. Ultrasonic
Answer» D. Ultrasonic
Explanation: Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.
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