One requires 11 \(eV\) of energy to dissociate a carbon monoxide molecule into carbon and oxygen atom. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lines in

Light with an energy flux of \(​​20 \ W/cm^{ 2 }\) falls on a non-reflecting surface at normal incidence. If the surface has an area of \(30 cm^{ 2 }\), the total momentum delivered (for complete absorption) during \(30\) minutes is:

An EM wave of intensity I falls on a surface kept in vacuum and experts radiation pressure kept in vacuum and experts radiation pressure p on it. Which of the following are true?

A plane electromagnetic wave travels in vacuum along the z-direction. what can you say about the direction of an electric and magnetic field vectors

An electromagnetic wave consists of oscillating electric and magnetic field. what is the phase relationship between these fields?

In a plane electromagnetic wave, the electric field varies with time having an amplitude. \(1 \ V{ m }^{ -1 }\) The frequency of a wave is \(0.5\times { 10 }^{ 15 }Hz.\) The wave is propagating along Z-axis. what is the average energy density of 
(i) electric field
(ii) magnetic field
(iii) total
(iv) what is the amplitude of magnetic field?

What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characteristic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb?

Why does galvanometer show a momentary deflection at the time of charging or discharging a capacitor? Write the necessary expression to explain this observation?

In a plane e.m. wave, the electric field oscillates sinusoidally at a frequency of \(2.0\times 10^{ 10 }\) Hz and amplitude \(48 \ Vm^{ -1 }\).
(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals to the average energy density of the B field. \(\left[ c=3.0\times 10^{ 8 } \ ms^{ -1 } \right] \)

A parallel plate capacitor of plate separation 2mm is connected in an electric circuit having source voltage 400 V. What is the value of the displacement current for \({ 10 }^{ -6 }\) second if the plate area is \(60 \ { cm }^{ 2 }\)?

The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B₀ = 510 nT. What is the amplitude of the electric field part of the wave?

Electromagnetic charge emits electromagnetic waves.

Light with an energy flux of 18 watt/cm² falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm² , find the average force exerted on the surface during a 30 minute time span, when no incident light is reflected. How will your result be modified if the surface is a perfect reflector?