66th B.P.S.C. (Pre) 2020
The velocity of electromagnetic waves is :
a$3 \times 10^8 ms^{-1}$✓ Correct
b$3 \times 10^7 ms^{-1}$
c$3 \times 10^6 ms^{-1}$
d$3 \times 10^5 ms^{-1}$
eNone of the above/More than one of the above
Explanation
Waves that do not require a material medium for propagation are called electromagnetic waves. Their speed in vacuum is equal to the speed of light, i.e., approximately $3 \times 10^8 ms^{-1}$.
general-science