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प्रश्न
Name the scientist who discovered Infra-red waves
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उत्तर
Hershell
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संबंधित प्रश्न
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong?
The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?
What is the range of the wavelength of the following electromagnetic waves?
(a) Ultraviolet
State the approximate range of wavelength associated with the ultraviolet rays.
Give one use of ultraviolet radiation.
Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from
The X-ray beam emerging from an X-ray tube
What potential difference should be applied across an X-ray tube to get X-ray of wavelength not less than 0.10 nm? What is the maximum energy of a photon of this X-ray in joule?
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Give one use of electromagnetic radiations in Infrared radiation.
Answer briefly.
Give two uses of radio waves.
