A) same wavelengths but different velocities
B) same frequency but different velocities
C) Same velocity but different wavelengths
D) Same velocity and same frequency
Correct Answer: C
Solution :
: In vacuum X-rays, gamma rays and microwaves travelling with same velocity, i.e. with the velocity of light \[c(=3\times {{10}^{8}}m/s)\]but different wavelengths.
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