• # question_answer Electromagnetic waves with wavelength (i) ${{\lambda }_{1}}$ is used in satellite communication (ii) ${{\lambda }_{2}}$ is used to kill germs in water purifiers (iii) ${{\lambda }_{3}}$ is used to detect leakage of oil in underground pipelines (iv)${{\lambda }_{4}}$ is used to improve visibility in runways, during fog and mist conditions (a) Identify and name the part of electromagnetic spectrum to which these radiations belong (b) Arrange the wavelengths in ascending order of their magnitude

(a) Microwave is used in satellite communications So. ${{\lambda }_{1}}$ is the wavelength of microwave. Ultraviolet rays are used to kill germs in water purifier. So. ${{\lambda }_{2}}$ is the wavelength of UV rays. X-rays are used to detect leakage of oil in underground pipelines. So, ${{\lambda }_{3}}$ is the wavelength Infrared is used to improve visibility on runways during fog and mist conditions. So, ${{\lambda }_{4}}$ is the wavelength of infrared waves. (b) Wavelength of X-rays < Wavelength of UV < Wavelength of infrared < Wavelength of microwave. $\Rightarrow$   ${{\lambda }_{3}}<{{\lambda }_{2}}<{{\lambda }_{4}}<{{\lambda }_{1}}$