What would be the absorbance of a solution having a transmittance of 1.500%

What are the applications of electromagnetic waves

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.

What practical value did astronomy offer to ancient civilizations?