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Q.
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.
(a)1, 2 and 3
(b)1, 2, 3 and 4
(c)2, 3 and 4 Right sign
(d)1 and 4
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