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प्रश्न
What is the approximate velocity of electromagnetic waves in vacuum?
विकल्प
\[3\times10^3\,\mathrm{m/s}\]
\[1.5\times10^{11}\,\mathrm{m/s}\]
\[2.1\times10^{-8}\,\mathrm{m/s}\]
\[3\times10^8\,\mathrm{m/s}\]
MCQ
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उत्तर
The speed of electromagnetic waves in free space or vacuum is approximately \[3\times10^8\,\mathrm{m/s}\]. It is a fundamental constant.
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