An electromagnetic wave of frequency \( 3 \mathrm{MHz} \) passes from Vacuum into a dielectric m...

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An electromagnetic wave of frequency \( 3 \mathrm{MHz} \) passes from Vacuum into a dielectric medium with relative permittiviy \( \epsilon=4.0 \) Then
(a) Wave length doubled and frequency remains unchanged
(b) Wave length is doubled and frequency becomes half
(c) Wave length is halved and frequency remains unchanged
(d) Wave length and frequency both remain unchanged
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