Electro-magnetic spectrum range, which is important for radiation varies from _____________ microns?
A. 1 to 100
B. 0.5 to 50
C. 10 to 100
D. 100 to 1000
A. 1 to 100
B. 0.5 to 50
C. 10 to 100
D. 100 to 1000