Column - I lists the waves of the electromagnetic spectrum. Column - II gives approximate frequency range of these waves. Match Column - I and Column - II and choose the correct match from the given choices.
| Column I | Column II | ||
|---|---|---|---|
| (A) | Radiowaves | (P) | $$ 10^{18} \text { to } 10^{20} \mathrm{~Hz} $$ |
| (B) | Microwaves | (P) | $$ 10^{11} \text { to } 5 \times 10^{14} \mathrm{~Hz} $$ |
| (C) | Infrared | (R) | $$ 10^4 \text { to } 10^8 \mathrm{~Hz} $$ |
| (D) | X-rays | (S) | $$ 10^9 \text { to } 10^{12} \mathrm{~Hz} $$ |
An electromagnetic wave of frequency $$3 \mathrm{~MHz}$$ passes from vacuum into a dielectric medium $$(\mu_r=1)$$ of relative permittivity 4.0. Then,
The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is
A plane electromagnetic wave of frequency $$20 \mathrm{~MHz}$$ travels through a space along $$x$$-direction. If the electric field vector at a certain point in space is $$6 \mathrm{~Vm}^{-1}$$, then what is the magnetic field vector at that point?
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