Work the problems below. To receive any credit, you must show all work.
You may submit your work in a word processing document or in a pdf file.
Graphic files are not acceptable submissions. Your file submission document
should be entitled Week5AYourGID (replace YourGID with your specific GID).
A source of
green light has a frequency of 6.2 x 1014 Hz. What is the
wavelength in nanometers (nm) and in ?
beam has an exit power of 100mW, an exit diameter of 3.8cm, and a divergence of
1.1. Calculate the intensity in mW/cm2 at 55m and the
size of the beam at that distance.
Suppose a 680-nm
beam with a power of 0.2 mW and a 4.5-cm diameter strikes a detector with a
0.2-cm diameter. How many photons strike the detector per second?
photomultiplier has a current gain of 3 x 106. A weak light
beam produces 55 electrons/s at the photocathode. What anode-to-ground
resistance must be used to get a 2.8 V voltage from the light pulse? The charge
of an electron is 1.6 x 10-19 coulomb.