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Q1. Monochromatic light of variable wavelength is incident normally on a thin sheet of plastic film in air. The reflected light is a maximum only for 472.9 and 696.0 in the visible spectrum. What is the minimum thickness of the film?

Q2. A 5.00 g lead bullet travelling at 330 m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet even as the other half is transmitted to the tree, what is the increase in temperature of bullet?

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Category:- Physics
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