Fluorine is the most reactive element in the halogen family

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Idon’t quite understand this problem