If the grating constant is 400 lines/mm, what is the spacing between the lines? a. 1/400 b. 1/40 cm c. 1/400 mm d. 400 mm e. 40 cm

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.