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The electromagnetic waves detected using a thermopile and used in physical therapy are

A : High frequency electromagnetic waves are detected by some means based on physical effects they produce on interacting with matter. R : The oscillating fields of an electromagnetic wave can accelerate charges and can produce oscillating currents therefore, an apparatus designed to detect EM waves is based on this fact.

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A plane electromagnetic wave of frequency 40 MHz travels in free space in the X -direction. At some point and at some instant, the electric field vecE has its maximum value of 750 N//C in Y - direction. The wavelength of the wave is-

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