Which one of following is not a longitudinal wave?

Ultrasonic wave

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Infrasonic wave

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Infrared wave

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Seismic wave

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Solution

The correct option is C Infrared wave
Ultrasonic wave , Infrasonic wave and Seismic wave are longitudinal waves
Infrared wave is Transverse wave
Therefore Infrared wave is not a longitudinal wave
Therefore correct option is $C$

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