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Which of the following waves can propagate in vacuum?
1 Radio waves 2 Light waves
3 X-rays 4 Ultrasonic waves
Select the correct answer using the codes given below:
1,2 and 3
1,2, 3 and 4
2, 3 and 4
1 and 4
Ultrasonic wave. Ultrasonic waves were a form of sound with a frequency beyond the upper limit of a Human's perception. They were used therapeutically for rehabilitation purposes in mental institutions in the 23rd century.
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