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प्रश्न
The speed of plane electromagnetic waves is maximum in ______.
विकल्प
glass
vaccum
tourmaline
water
MCQ
रिक्त स्थान भरें
उत्तर
The speed of plane electromagnetic waves is maximum in vaccum.
Explanation:
`v = 1/(sqrt(mu_0 mu_tau∈_"o"∈_"r")) = "c"/sqrt(∈_"r"mu_"r")`
Since, `∈_"r"mu_"r"` > 1,
Thus, c (speed of light in vacuum) > v (speed of light in any other medium)
Hence it is maximum in a vacuum.
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