Ch. 5 & 11 measurement & light                     test [50 points]

Show your work in an organized manner, include (i) any relevant equation (or formula), (ii) conversion factor(s), (iii) put the proper units in your calculations and answer, and (iv) have the proper number of significant figures in your answer.

1. In regards to light,  [10 points]

a. What is the energy of light if it has a frequency of 3.5 MHz ?

b.  What is the wavelength of light if it has an energy of 2.5 * 10-19 Joules ?

2. In regards to the line spectrum in a hypothetical atom, where the atom emits (or absorbs) blue and green light, describe the basis of the ___ spectrum with respect to the electron energy level in the atom.  Clearly identify the transition for blue versus green light.  [10 points]

a.  Emission

b.  Absorbance

3.  Solve  [10 points]

a. 2.0  ÷  3.00 =  ________

b.  3.14  +  2.576  =  _________

c.  (1.25 * 103)  +  (0.036 * 103)  =  ____________

d. 5.03  =  __________

e. (1.25 * 103)  *  (0.036 * 103)  =  ____________

4. Solve  [10 points]

a. 1500. Meters  =  ___________  mile; hint:  1760 yards = 1.0 miles, exactly

b.  375 mm2  =  ___ m2

5.  What is the length (in meters) of a 75.0 g cylinder with a diameter of 5.0 mm and a density of 8.0 g / mL ?  [10 points]