Question

Show that no signal can travel faster than light

Answer 1

light has the speed of 3×100000000 which is higher than any other signel

Answer 2

almost all the radiations travel with speed of light...like alpha rays gamma rays etc ..

but it is not specific that only light has that unique speed.

some signals are also there, which cannot travel with

$3 \times 10 {}^{8} m \: per \: sec$

hope this answer will help you

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