What ways is carbon added to the atmosphere

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.

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

How many molecules are in 6.0 moles of methane