Out of the following, the one which can pass through 20 cm thickness o

1.	Out of the following, the one which can pass through 20 cm thickness of steel is
A.	- rays
B.	- rays
C.	y - rays
D.	ultraviolet rays
Answer» D. ultraviolet rays

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Out of the following, the one which can pass through 20 cm thickness of steel is

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