निम्न वर्णित विद्युत चुम्बकीय तरंगों ( Electromagnetic Waves ) में न्यूनतम आवृति ( Frequency ) की तरंगें है ?
A. गामा किरणें ( Y-rays )
B. एक्स किरणें ( X - rays )
C. सूक्ष्म तरंगें ( Micro waves )
D. रेडियों तरंगें ( Radio waves )
उत्तर 4
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