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Question

Pick up the correct statement from the following:



Options:
A .  The wave length of gamma rays is `10^(-10) m`
B .  The wave length of radio rays is `10^6 m`
C .  The visible length occupies a small portion of the electromagntic spectrum extending roughly from` 0.4 mu m to 0.7mu m` wave length
D .  All of these
Answer: Option D



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