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प्रश्न
Name the radiation which can be detected by thermopile.
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उत्तर
Infrared radiation
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संबंधित प्रश्न
What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.
Name the waves used for taking photographs in dark.
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
| Gamma rays | D | C | Visible light | B | A |
The above table shows different parts of the electromagnetic spectrum.
(a) Identify the parts of the spectrum marked as A, B, C and D.
(b) Which of the radiations A or B has the higher frequency?
(c) State two properties which are common to all parts of the electromagnetic spectrum.
(d) Name one source of each of the radiation of electromagnetic spectrum.
(e) Name one detector for each of the radiation.
(f) Name one use of each of the radiation.
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Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.
Name two sources of infrared radiation.
Choose the correct option.
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What is the speed of radio waves in vacuum?
