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`10 ^(-10 )` मी तरंगदैर्ध्र्य की X - किरणों , 6800 Å तरंगदैर्ध्र्य के प्रकाश , तथा 500 मी की रेडियो तरंगो के लिए किस भौतिक राशि का मान समान है ?

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निर्वात में सभी विधुत चुम्बकीय तरंगे की चाल समान होती है
अंत : `C=3xx10^(8)m S^(-1)`

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