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I believe is that in problem 15, they had a number of 102.6, which has 4 significant figures so they round the speed of light to 4 sig figs. Meanwhile, in problem 17, they didn't specify a number so they used the actual number of the speed of light.
Regarding the constant for the speed of light, should we always use 2.99792 x 10^8 or is it okay to round to 3.0 x 10^8? In the lectures 3.0x10^8 is used, but on the constants and equations sheet it says 2.99792 x 10^8
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