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प्रश्न
What role dose infra-red radiation play in maintain the Earth’s warmth
उत्तर
Visible light from the atmosphere is absorbed by the Earth’s surface and radiated as infrared radiation which gets trapped by greenhouse gases such as carbon dioxide and water vapour. This is how infrared radiation also plays an important role in maintaining the Earth’s warmth
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संबंधित प्रश्न
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
Name the rays or waves of highest frequency .
Cutoff wavelength of X-rays coming from a Coolidge tube depends on the
(a) target material
(b) accelerating voltage
(c) separation between the target and the filament
(d) temperature of the filament.
The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.
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.)
Name the scientist who discovered
X-rays
Name the scientist who discovered Visible light
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(i) radar and
(ii) eye surgery. Write their frequency range.
Answer briefly.
Give two uses of radio waves.
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
