Ch.11  light                  test                   35 points                                                                      honors Chem

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.Solve.  [15 points]

a. How much energy is there in a photon of light with a frequency of 25 MHz ?

b. What is the frequency of light with a wavelength of 125 micrometers ?

c. What is the energy of light with a wavelength of 375 millimeters ?

2.  Describe and rationalize the absorption spectrum of hydrogen.  [10 points]

3. Assume that the transition of an electron in the n = 3, 4, and 5 energy levels goes to the n = 2 energy level.  [10 points]

a. Would it generate an emission or absorption spectrum ?

b. Fill-in the below blank with the color: green, orange, or blue

i. n = 3 →  n = 2 has color =  _________

ii.  n = 4 → n = 2 has color =  __________

iii. n = 5 → n = 2 has color =  __________

iv.  justify / rationalize your answer to part b.