Tag: speed of light and optical density
Questions Related to speed of light and optical density
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An electromagnetic wave of frequency $\nu= 3\ MHz$ passes from vacuum into a dielectric medium with permittivity $\varepsilon= 4$. Then
An electromagnetic wave is propagating along x-axis. At x = 1 m and t = 10 s, its electric vector |$\overset{-}{E}| = 6 V/m$ then the magnitude of its magnetic vector is:
The electric field associated with an electromagnetic wave in vacuum is given by $|\overrightarrow { E } |= 40\ cos (kz -6\times{10}^{8}t )$, where $E$, $z$ and $t$ are in volt per meter, meter and second respectively. The value of wave vector $k$ is:
The velocity of electromagnetic waves in a dielectric medium $\left( { \varepsilon } _{ r }=2 \right) $ is:
If the relative permeability of a medium is $ \mu _r$ and its dielectric constant is $\varepsilon _r$ then the velocity of light in that medium will be
The speed of electromagnetic wave in vacuum depends upon the source of radiation. It
The electromagnetic waves travel with a velocity
The speed of electromagnetic wave is same for
The formula for the velocity of electromagnetic waves in vacuum is given by
The amplitudes $E _{0}$ and $B _{0}$ of electric and the magnetic component of an electromagnetic wave respectively are related to the velocity $c$ in vacuum as