Dear Readers, Welcome to Electromagnetic Spectrum Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Electromagnetic Spectrum. These Electromagnetic Spectrum Questions are very important for campus placement test and job interviews. As per my experience good interviewers hardly plan to ask any particular questions during your Job interview and these model questions are asked in the online technical test and interview of many IT & Non IT Industries.
Electromagnetic spectrum is the range of all the frequencies or wavelengths of electromagnetic radiation.
Electromagnetic radiation is a form of energy in which electric, magnetic fields are mutually perpendicular to each other, and these two electric, and magnetic fields are perpendicular to the direction of wave propagation.
The various types of electromagnetic radiation include:
Radio waves are mainly used for fixed and mobile radio communication.
Radio waves have the wavelength ranging from 1mm to 100km and frequencies ranging from 3KHZ to 300GHZ.
Microwaves are used in microwave ovens, telemetry, and radar.
Microwaves have the wavelength ranging from 10 micrometer to 10 meter.
Infrared rays are used in cameras for night vision and in medical treatments.
William Herschel discovered infrared radiation in 1800.
The different colors of visible light include:
Ultraviolet light is used to kill bacteria and other microbes.
Ultraviolet light has the wavelengths ranging from 100 nanometers to 400 nanometers.
X-rays are used to identify the bone fractures by passing radiation into internal body.
Gamma rays have the wavelengths ranging from 0.0001 nanometer to 0.1 nanometer.
Gamma rays are used to kill cancerous cells.