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A positron emerges normally from a 4-mm-thick plastic slab (density 1.14 g cm–3) with an energy...

A positron emerges normally from a 4-mm-thick plastic slab (density 1.14 g cm–3) with an energy of 1.62 MeV. What was its energy when it entered the slab?

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Answer #1

Here in this case firstly we look at the equation relating final energy to the range of the particle that is :

Given thickness of the slab is 0.4 cm and hence:

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