Advertisements
Advertisements
प्रश्न
Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from
पर्याय
the kinetic energy of the striking electron
the kinetic energy of the free electrons of the target
the kinetic energy of the ions of the target
an atomic transition in the target
Advertisements
उत्तर
the kinetic energy of the striking electron
In an X-ray tube, electrons are emitted by the filament when it is heated. An electric field generated by a DC battery between the filament and the target makes the electrons hit the target atoms with a very high speed. As a result, the electrons lose their kinetic energy to eject photons, which leads to a continuous emission of X-rays.
APPEARS IN
संबंधित प्रश्न
What role dose infra-red radiation play in maintain the Earth’s warmth
What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?
Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?
(a) Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum.
(b) Which of the radiation mentioned by you in part (a) has the highest penetrating power.
Which radiation is used for satellite communication?
Name the region beyond the red end of the spectrum.
X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?
Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows.
| Cell containing vacancy | K | L | M |
| Energy in keV | 69.5 | 11.3 | 2.3 |
State two properties of infrared radiations which differ from visible light.
State three properties of infrared radiations similar to that of visible light.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
For television broadcasting, the frequency employed is normally
Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.
Radio waves of constant amplitude can be generated with.
What is called the invisible spectrum?
Which set lists uses of microwaves?
