Advertisements
Advertisements
प्रश्न
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
Advertisements
उत्तर
An e.m. wave carries momentum with itself and is given by
P = `"Energy of wave (U)"/"Speed of the wave (c)"`
= `"U"/"c"`
when it is incident upon a surface it exerts pressure on it.
APPEARS IN
संबंधित प्रश्न
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the scientist who discovered Infra-red waves
Name the radiation of the electromagnetic spectrum which is used for the following:
To photograph internal parts of the human body and Give the frequency range
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
Microwaves are electromagnetic waves with frequency in the range of.
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-
Name one radiation having the wavelength longer than the wavelength of these radiations.
