1 anbspin your own words describe briefly the phenomenon of


1. (a) In your own words describe briefly the phenomenon of luminescence.

(b) What is the distinction between fluorescence and phosphorescence?

2. In your own words, briefly describe the phe- nomenon of photoconductivity.

3. Briefly explain the operation of a photo- graphic lightmeter.

4. In your own words, describe how a ruby laser operates.

5. Compute the difference in energy between metastable and ground electron states for the ruby laser.

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Mechanical Engineering: 1 anbspin your own words describe briefly the phenomenon of
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