An argon ion laser emits light of wavelength of 488 nm. (a) calculate the frequency of the light. (b) suppose a pulse of light from this laser is sent from earth, is reflected from a mirror on the moon, and returns to its starting point. calculate the time elapsed for the round trip, taking the distance from earth to the moon to be 3.8×10^5 km.

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.