The Photoelectric Effect, CCDs, and the Legacy of Einstein

Pictures of CCD(interactive on buildiing a CCD)

CCD Lab

Using the CCD Lab, answer the following.

1.  You want to put together a space telescope.  To start with, you decide you need to check out the metal surface of your CCD.   What surface(s) could you use to detect the following  types of light at 100% intensity (make a table as shown below)?

Surface Metal      x-rays      purple        blue     green   yellow     orange      red
sodium
zinc
platinum
copper
calcium

2.  Now, decide which metal you will use for the primary CCD telescope.   Now, check the wavelength range at various intensities  (10%, 20%, 40%, 80%, 100%) using the table below?    How effective will this telescope be for bright objects?   Dim objects?

Intensity                     10%                20%                  40%                  80%                100%

Wavelength range


3.  Take a look at the values of current for a 75% intensity light on a platinum surfaceand write the current into the table below..

Wavelength vs. Current

100nm       200nm       300nm       400nm        500nm         600nm           700nm



What does the data in #3 tell you about the effectiveness of a CCD for ALL wavelengths of lights?   How would an alloy try to deal with this value?



4.  If you were to construct a space telescope, would you have more than one telescope available on a platform?   Explain your reasoning.


Turn in this sheet INDIVIDUALLY at the end of the hour.9