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# Which of the following are not electromagnetic waves?

$\begin {array} {1 1} (a)\;\text{cosmic rays} & \quad (b)\;\text{gamma rays} \\ (c)\;\beta\: \text{rays} & \quad (d)\;\text{X-rays} \end {array}$

Can you answer this question?

Ans : (c)
$\beta$ rays
answered Feb 27, 2014