Advertisements
Advertisements
प्रश्न
Why is the amount of the momentum transferred by the em waves incident on the surface so small ?
उत्तर
Momentum transferred = \[\frac{\text { Energy}}{\text { Speed of light }} = \frac{h\nu}{c}\] \[\approx\] (for \[\nu~ {10}^{20}\] Hz)
Thus, the amount of the momentum transferred by the em waves incident on the surface is very small.
APPEARS IN
संबंधित प्रश्न
A capacitor is connected to an alternating-current source. Is there a magnetic field between the plates?
How are electromagnetic waves produced? What is the source of the energy carried by a propagating electromagnetic wave?
Identify the electromagnetic radiations used
(i) In remote switches of a household electronic device; and
(ii) as a diagnostic tool in medicine
Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is ______.
What is displacement current?
Give two uses of IR radiation.
The electric field of a plane electromagnetic wave travelling in +ve z-direction is described by ______.
For which frequency of light, the eye is most sensitive?
A linearly polarized electromagnetic wave given as E = Eoî cos (kz – ωt) is incident normally on a perfectly reflecting infinite wall at z = a. Assuming that the material of the wall is optically inactive, the reflected wave will be given as ______.
Poynting vectors S is defined as a vector whose magnitude is equal to the wave intensity and whose direction is along the direction of wave propagation. Mathematically, it is given by `S = 1/mu_0 E xx B`. Show the nature of S vs t graph.
A 27 mW laser beam has a cross-sectional area of 10 mm2. The magnitude of the maximum electric field in this electromagnetic wave is given by:
[Given permittivity of space ∈0 = 9 × 10-12 SI units, Speed of light c = 3 108 m/s]
