Question

Electromagnetic waves with wavelength
(i) `lambda_1` is used in satellite communication.
(ii) `lambda_2` used to kill germs in water purifier.
`lambda_` used to detect leakage of oil in underground pipelines.
`lambda_4` used to improve visibility in runways during fog and mist conditions.
(a) Identify and name the part of e.m. spectrum to which these radiations belong.
(b) Arrange these wavelengths in ascending order of their magnitude.
(c) Write one more application of each.

Answer 1

(i) Microwave is used in satellite communications.
So `lambda_(1)` is the wavelength of microwave.
(ii) Ultraviolet rays are used to kill germs in water purifier So `lambda_(2)` is the wavelength of UV rays.
(iii) X-rays are used to detect leakage of oil in underground pipelines .So `lambda_(3)` is the wavelength of X-rays.
(iv) Infrared is used to improve visibility on runways during fog and mist condition. So, it is wavelength of infrared waves.
(b) Wavelength of X-rays `lt` wavelegth of `UV lt` wavelegth of infrared `lt` wavelength of microwave.
`rArr" "lambda_(3) lt lambda_(2) lt lambda_(4) lt lambda_(1)`
(c) (i) Mirowave is used in rader.
(ii) UV is used in LASIK eye surgery.
(iii) X-rays is used to detect a fracture in bones.
(iv) infrared is used in optical communication.