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Which of the following waves can propagate in a 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, 3 and 4

4,1,3 and 2

1 and 4

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Explanation:

All electromagnetic waves can propagate in a vacuum. Of your list, radio waves, light waves and X-rays are all part of the electromagnetic spectrum, so they can propagate in a vacuum. Ultrasonic waves are sound waves, and cannot propagate in a vacuum. So, to sum up:
Radio waves can propagate in a vacuum.
Light waves can propagate in a vacuum.
X-rays can propagate in a vacuum.
Ultrasonic waves cannot propagate in a vacuum.