Which of the following is/are transverse wave(s)?

Ultrasonic wave in air

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Infrasonic wave in air

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Infrared waves in air

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Radio waves in vacuum

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Solution

The correct options are
C
Infrared waves in air

D
Radio waves in vacuum

Longitudinal waves are those in which particle of the medium vibrates parallel to the direction of propagation of the wave. Sound waves in air are longitudinal. Ultrasonic and infrasonic waves are sound waves and are longitudinal waves in air.

Infrared and radio waves are electromagnetic waves, they are transverse waves in any medium or vacuum.

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