An em wave is propagating in a medium with a velocity $\vec v =v\hat i.$ The instantaneous oscillating electric field of this em wave is along $+y$ axis. Then the direction of oscillating magnetic field of the em wave will be along
An em wave is propagating in a medium with a velocity $\vec v =v\hat i.$ The instantaneous oscillating electric field of this em wave is along $+y$ axis. Then the direction of oscillating magnetic field of the em wave will be along
- [NEET 2018]
- A
$- z$ direction
- B
$+ z $ direction
- C
$- x$ direction
- D
$- y$ direction
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Give equation which relate $c,{\mu _0},{ \in _0}$.
Give equation which relate $c,{\mu _0},{ \in _0}$.
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A laser beam can be focussed on an area equal to the square of its wavelength A $He-Ne$ laser radiates energy at the rate of $1\,mW$ and its wavelength is $632.8 \,nm$. The intensity of focussed beam will be
If a source of electromagnetic radiation having power $15 kW$ produces $10^{16}$ photons per second, the radiation belongs to a part of spectrum is.(Take Planck constant $h =6 \times 10^{-34}\,Js$ )
If a source of electromagnetic radiation having power $15 kW$ produces $10^{16}$ photons per second, the radiation belongs to a part of spectrum is.(Take Planck constant $h =6 \times 10^{-34}\,Js$ )
- [JEE MAIN 2023]
The speed of electromagnetic wave in vacuum depends upon the source of radiation
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The ratio of contributions made by the electric field and magnetic fleld components to the intensity of an electromagnetic wave is :
$(c=$ speed of electromagnetic waves)
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$(c=$ speed of electromagnetic waves)
- [NEET 2020]