What forces act between molecules in a molecular compound and formula units in an ionic compound?

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.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Particles vibrate in a rigid structure and do not move relative to their neighbors.