Which of the following electronic transitions in the oxygen atom will result in light emission? A. n i= 1⟶nf = 2
B. n i= 1⟶nf =3
C. n i =3⟶n f =2
D. n i =2⟶n f =3

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining