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6. Depostion
A mirror is plated by evaporation. The gold in a crucible is heated and melted in a vacuum chamber by passing
an electric current. The gold atoms fly off in all directions, and a portion of them sticks to the glass (or to other
gold atoms already on the glass plate). Assume that each column of deposited atoms is independent of neighboring
columns, and that the average deposition rate is d layers per second.
a. What is the probability of m atoms deposited at a site after a time t? What fractions of the glass is not covered
by any gold atoms?
b. What is the variance in the thickness?
Transcribed Image Text:6. Depostion A mirror is plated by evaporation. The gold in a crucible is heated and melted in a vacuum chamber by passing an electric current. The gold atoms fly off in all directions, and a portion of them sticks to the glass (or to other gold atoms already on the glass plate). Assume that each column of deposited atoms is independent of neighboring columns, and that the average deposition rate is d layers per second. a. What is the probability of m atoms deposited at a site after a time t? What fractions of the glass is not covered by any gold atoms? b. What is the variance in the thickness?
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