Name the parts of the electromagnetic spectrum which are
(i) stopped by the face mask worn by welders,
(ii) used in the detectors in Earth satellites, and
(iii) used in the 'short-wave band' in communication. Also write the order of wavelengths in each case.
(i) stopped by the face mask worn by welders,
(ii) used in the detectors in Earth satellites, and
(iii) used in the 'short-wave band' in communication. Also write the order of wavelengths in each case.
Solution
(i) The welder's mask stops ultraviolet rays, whose wavelength is of the order of nm to nm ( m).
(ii) Detectors in Earth (remote-sensing/weather) satellites use infrared rays, wavelength about 700 nm to 1 mm.
(iii) The 'short-wave band' in communication uses radio waves, wavelength greater than about 0.1 m (tens of metres for the short-wave band).
Order of wavelengths: ultraviolet infrared radio waves.
(ii) Detectors in Earth (remote-sensing/weather) satellites use infrared rays, wavelength about 700 nm to 1 mm.
(iii) The 'short-wave band' in communication uses radio waves, wavelength greater than about 0.1 m (tens of metres for the short-wave band).
Order of wavelengths: ultraviolet infrared radio waves.
CBSE Class 12 Board · 2024 · Subjective