1. Calculate the wavelengths for the following electron orbit transitions.
a. n; = 3; n = 2
b. n;= 4; n = 2
c. ni=5;ne=2
d. n = 6; n = 2

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

The velocity of any object depends upon a) the location of the object. b) the location of the observer. c) which measurement tools are used. d) the relative motion of the observer.

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol