E 2 = R 2 +T 2 +A 2 (2)
or
A 2 = E 2 −R 2 −T 2 . (3)
Thus, the percentage f A of the incident microwave intensity absorbed by a material is
f A = [(E 2 −R 2 −T 2 )/E 2 ]×100%. (4)
INTERFERENCE
When two separate waves occupy the same region of space, they combine with each other. According to the superposition principle, the displacement of the resultant wave is equal to the sum of the displacements of the individual waves. If the crests of the individual waves coincide with each other, then the amplitude of the resultant wave is a maximum, and the waves are said to undergo constructive interference. On the other hand, if the crest of one wave coincides with the trough of the other wave, then the amplitude of the resultant wave is zero at all points, and the waves undergo destructive interference. Waves that interfere constructively “build each other up” and have a maximum intensity, while those that interfere destructively “cancel each other out” and have a minimum intensity.
E 2 = R 2 +T 2 +A 2 (2)
or
A 2 = E 2 −R 2 −T 2 . (3)
Thus, the percentage f A of the incident microwave intensity absorbed by a material is
f A = [(E 2 −R 2 −T 2 )/E 2 ]×100%. (4)
INTERFERENCE
When two separate waves occupy the same region of space, they combine with each other. According to the superposition principle, the displacement of the resultant wave is equal to the sum of the displacements of the individual waves. If the crests of the individual waves coincide with each other, then the amplitude of the resultant wave is a maximum, and the waves are said to undergo constructive interference. On the other hand, if the crest of one wave coincides with the trough of the other wave, then the amplitude of the resultant wave is zero at all points, and the waves undergo destructive interference. Waves that interfere constructively “build each other up” and have a maximum intensity, while those that interfere destructively “cancel each other out” and have a minimum intensity.
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