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39 Cards in this Set
- Front
- Back
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Electromagnetic Spectrum |
The orderly distribution of the electromagnetic waves in accordance with their wavelength or frequency into distinct groups having widely differing properties |
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Wavelength of radiowaves |
600m-0.1m (>0.1m) |
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Frequency of radiowaves |
500kHz-1000MHz |
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AM band frequency |
530kHz-1710kHz |
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Short wave bands |
1710Hz-54Hz |
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TV waves frequency |
54MHz-890MHz |
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FM band frequency |
88MHz-108MHz |
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Radiowave production |
Accelerated motion of charged particles in conducting wires/oscillating circuits |
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Radiowave detection |
Receiver's aerials |
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Uses of radiowaves |
Radio and television communication systems Radioastronomy |
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Microwave wavelength |
0.1m-1mm |
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Microwave frequency range |
10^9-10^12 Hz |
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Source of microwaves |
Oscillating currents in special vacuum tubes like klystrons, magnetrons and Gunn diodes |
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Detection of microwaves |
Point contact diodes |
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Uses of microwaves |
Radar systems for aircraft navigation Long distance communication systems via geostationary satellites Microwave ovens |
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How do microwave ovens work |
The resonant frequency of the water molecules match the frequency of microwaves |
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Wavelength of Infrared waves |
1mm-700nm |
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Frequency of Infrared waves |
10^11-5×10^14 |
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Infrared wave production |
Vibration of atoms and molecules |
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Detection of Infrared waves |
Thermopiles Bolometer Infrared photographic film |
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Uses of Infrared waves |
Remote control of TVs Green houses to maintain temp Haze Photography Infrared lamps for physiotherapy |
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Visible light wavelength |
700-400nm |
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Frequency of visible light |
4 × 10¹⁴ -7 × 10¹⁴ Hz |
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Visible ray production |
Electrons in atoms emit light when they move from one energy level to a lower energy level |
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Visible ray detection |
The eye Photocells Photographic film |
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UV rays wavelength |
400 nm- 1 nm |
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UV rays frequency range |
10^16-10^17 Hz |
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UV ray production |
Inner shell electrons in atoms moving from one energy level to a lower level |
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UV ray detection |
The eye Photographic fim |
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UV ray uses |
Food preservation Study of molecular structure |
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X rays wavelength |
1nm-10^-3m |
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X ray frequency |
10^16-10^19Hz |
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X rays production |
X ray tubes or inner shell electrons |
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X ray detection |
Photographic film Geiger tubes Ionisation chamber |
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Uses of X rays |
Medicine for diagnostic purposes Studying crystal structure |
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Gamma ray frequency range |
10^18-10^22 |
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Gamma ray wavelength |
< 10^-3 |
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Gamma ray production |
Radioactive decay of nucleus |
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Uses of gamma rays |
Radiotheraphy Initiate nuclear reactions Preservation of food Study structure of atomic nuclei |
