Electromagnetic...

A light of wavelength $$6000 A^0$$ in air, enters a medium with refractive index 1.5. What will be the wavelength of light in the medium?

A pulse of light of duration $$100\ ns$$ is absorbed completely by a small object initially at rest. Power of the pulse is $$30\ mW$$ and the speed of light $$3\times 10^8 m/s.$$ The final momentum of the object is

Light of intensity$$ = 3 W/m^{2}$$ is incident on a perfectly absorbing metal surface of area  $$1 m^{2}$$ making an angle of $$60^0$$ with the normal. If the force exerted by the photons on the surface is $$p \times 10^{-9}$$ (in Newton), then the value of p is :

If $$\vec{E}$$ and $$\vec{B}$$ are the electric and magnetic field vectors of electromagnetic waves, then the direction of propagation of the electromagnetic wave is along the direction of

The displacement current will be

The incident intensity on a horizontal surface at sea level from the sun is about $$1 kW m^{-2}$$. Assuming that 50 per cent of this intensity is reflected and 50 per cent is absorbed, determine the radiation pressure on this horizontal surface (in pascals).

A parallel beam of light is incident normally on a plane surface absorbing 40 % of the light and reflecting the rest. If the incident beam carries 60 watt of power, the force exerted by it on the surface is:

The electric field part of an electromagnetic wave in vacuum is
$$E=3.1\cos { \left[ \left( 1.8\dfrac { rad }{ m }  \right) y+\left( 5.4\times { 10 }^{ 8 }\dfrac { rad }{ s }  \right) t \right] \hat { i }  } $$ the wavelength of this part of electromagnetic wave is

Sea water at frequency $$\nu \  =\  4\  x\  { 10 }^{ 8 }$$ Hz has permittivity $$\varepsilon  \  \approx \  80\  { \varepsilon   }_{ 0 }$$, permeability $$\mu \  \approx \  { \mu  }_{ 0 }$$ and resistivity $$\rho \  =\  0.25\  \Omega m$$. Imagine a parallel plate capacitor immersed in sea water and driven by an alternating voltage source V(t) = $${ V }_{ 0 }\  \sin { \  (2\pi \nu t) }$$. The of amplitude of the displacement current density to the conduction current density is

Choose the correct answer from the alternatives given.
A parallel plate capacitor with plate area $$A$$ and separation between the plates $$d$$ is charged by a constant current $$I$$. Consider a plane surface of area $$\dfrac{A}{2}$$ parallel to the plate and drawn between the plates. The displacement current through the area is :