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Answer the following.
Which physical quantity is the same for UV rays, red light and radio waves when they are travelling…
Which physical quantity is the same for UV rays, red light and radio waves when they are travelling in vacuum?
Answer
Answer
AISpeed in vacuum (the speed of light, $c = 3 \times 10^{8}\text{ m s}^{-1}$) is the same for all electromagnetic waves.
From ISC 2026 Physics Paper 1, question 7(ii).