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`10^(-10)` मीटर तरंगदैर्ध्य की x-किरणों, 6800 `Å` तंरंगदैध्ध्य के प्रकाश, तथा 500 मीटर की रेडियों तरंगों के लिए किस भौतिक राशि का मान समान है?

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`10^(-10)` मीटर तरंगदैर्ध्य की x-किरणों, 6800 `Å` तंरंगदैध्ध्य के प्रकाश, तथा 500 मीटर की रेडियों तरंगों के लिए किस भौतिक राशि का मान समान है?
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यहाँ x-तरंगें लाल प्रकाश तथा रेडियों तरंगें सभी वैद्युत चुम्बकीय तरंगें हैं। हम जानते हैं कि सभी वैद्युत चुम्बकीय तरंगें प्रकाश के वेग से गति करती हैं, अत: सभी तरंगों की चाल समान है।
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