Difference between water bath and incubator

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.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

The ammonia molecule in the diagram has the observed bond orientation because