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The drawing shows three energy levels of a laser that are involved in the lasing action. These levels are analogous to the
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Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature
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589 views
Two wires have the same cross-sectional area and are joined end to end to form a single wire. The first wire has a temperature
1 answer
693 views
