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Mr. Dubey • 53.50K Points
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Q.                    is a device that converts electrons to photons or vice-versa.

(A) antenna
(B) electron gun
(C) photon amplifier
(D) microwave tube
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Explanation by: Mr. Dubey 
 antenna is a device that converts electrons into photons or vice versa. a transmitting antenna converts electrons into photons while a receiving antenna converts photons into electrons.

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