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Which of the following cannot travel in vacuum?

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in Physics – Class 12 by (135k points)
Which of the following cannot travel in vacuum?

(a) Radio waves

(b) Gamma Waves

(c) Infrared Waves

(d) Infrasonic waves

This question was posed to me during an interview for a job.

My question comes from Electromagnetic Spectrum topic in chapter Electromagnetic Waves of Physics – Class 12

1 Answer

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Right choice is (d) Infrasonic waves

Explanation: Radio waves, gamma waves, and infrared waves are electromagnetic waves and due to this they do not need any material medium to travel and hence, can travel in vacuum. Whereas, infrasonic waves are mechanical waves and so, they need a material medium to travel. Therefore, infrasonic waves cannot travel in vacuum.

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