किसने प्रयोग के जरीए दशा॔य – McqOptions

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1.	किसने प्रयोग के जरीए दशा॔या कि जल में प्रकाश की चाल वायु में प्रकाश की चाल से कम है ?
A.	किरखोफ
B.	नील बोर
C.	ऐटून
D.	फूको
Answer» E.

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