Alpha radiation:
a. is not harmful as it is not able to penetrate human skin
b. can be harmful to humans if the materials are inhaled, swallowed, or absorbed through open wounds
c. can travel long distances through air
d. cannot be measured by scientific instruments

Acm ruler with main graduations from 1 to 10 from left to right there are 10 secondary graduations between each of the main graduations there is a line that begins. at the left end of the ruler 10 secondary graduations to the left of the “1 main graduation the right end of the line ends on the eighth secondary graduation to the right of 3 how long is the line