Explanation:
It is given that,
Frequency of the laser light, 
Time,
(a) Let
is the wavelength of this light. It can be calculated as :



or

(b) Let n is the number of the wavelengths in one pulse. It can be calculated as :


n = 13440
Hence, this is the required solution.
Sorry I'm so late, but I just took this test and the answer is white (for people who didn't study well ;) )
<span>d. scientific theories summarize patterns found in nature
Hope this helps!</span>