Micro Wave


Low Frequency Radiation - Concepts
Class - 9th Aus Edu Subjects
 
 
Concept Explanation
 

Micro Wave

Microwaves are the electromagnetic waves of frequency range 1 GHz to 1000 GHz with respective wavelengths of 30 to 0.03 cm (between 1mm and 1m) . Microwaves are electromagnetic waves that travel with a speed of 3 × 108 m/s. the energy level of microwaves is  2 x 10-24- 2 x 10-22 .

  • Within this spectral domain are a number of communication systems applications that are important in both the military and civilian sectors. 
  • They are produced by special vacuum tubes, namely; klystrons, magnetrons and Gunn diodes etc.
  • Microwaves are used in Radar systems for air craft navigation.
  •   Microwaves are produced by special vacuum tubes. 
  • Microwave is a color of light, too low-energy for you to see, lower-energy even than infrared, but higher-energy than radio.
  • Microwave ovens produce large amounts of this light. 
  •  Despite the potential for near-instant snack food,
  • The first commercial Radarange microwave ovens unveiled by Raytheon in 1946 were intended for use in restaurants (as in the photo at the top, which shows a prototype called the “Raydarange”) and for reheating meals on airplanes.
  • Uses

    (i) A radar using microwave can help in detecting the speed of tennis ball, cricket ball, automobile while in motion.

    (ii) Microwave ovens are used for cooking purposes.

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    Sample Questions
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    Question : 1

    The range of the wavelength of microwaves is ________________ .

    Right Option : A
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    Explanation
    Question : 2

    Microwaves are electromagnetic waves with frequency, in the range of ________________________ .

    Right Option : C
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    Explanation
    Question : 3

    The energy level of microwaves is __________________.

    Right Option : B
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    Explanation
     
     


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