A water purification system uses electromagnetic energy to kill bacteria. Which region of the spectrum is being utilised for this function?
Ultraviolet part of the spectrum
Ultraviolet radiation has enough energy to damage the DNA and cell structures of microorganisms without ionising water molecules the way gamma rays would.
Because of this germicidal property, UV lamps are widely used in water purifiers to disinfect water by killing bacteria and viruses.
Hence, the ultraviolet part of the spectrum is used for this function.
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Important Questions from Electromagnetic Waves
- Consider the following statements about electromagnetic radiation (EMR) and choose the correct statements:
A. Scattering by the atmosphere depends on the size of atmospheric particles and the wavelength of radiation
B. Rayleigh scattering is not inversely proportional to the fourth power of the wavelength
C. There are two types of scattering: elastic and inelastic scattering
D. The amount of Mie scattering is greater than Rayleigh scattering
Choose the correct answer from the options given below : - Which one of the following is NOT true for an electromagnetic wave?
- Which electromagnetic radiation(s) is/are used to cook food?
The waves used in radar systems are _______ waves.
Consider the two statements given below :
Statement-1: Infrared waves are also called heat waves.
Statement-2: Water molecules readily absorb infrared waves.
Select the correct answer using the code given below:
