The thing that is different between x-rays and radio waves is
1) their charges,
2) their masses,
3) their frequencies,
4) the medium through which they travel,
5) the speeds at which they travel,
and the thing that is the same for x-rays and radio waves is
6) their masses.
7) their frequencies.
8) the medium through which they travel.
9) the speeds at which they travel.
10) none of these.
Answer: 3, 9
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