The maximum contaminant level of fluoride (F−) in drinking water as set by the the Environmental Protection Agency (EPA) is 0.0040 g⋅L−1 . Express this concentration in parts per million (ppm). Assume the density of water is 1.00 g/mL .

100mg magnesium reacts with 20ml of 1.0m hcl

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Displacement is the slope of a velocity vs. time graph a. true b. false