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Q1. A proton is travelling to the right at. It has a head-on perfectly elastic collision with a carbon atom. The mass of the carbon atom is 12 times the mass of the proton. What are the speeds of each after the collision? What is the direction of the proton after the collision? What is the direction of the carbon atom after the collision?

Q2. A gold nucleus has a radius of 6.23 fm and alpha+- particle has of 1.8 fm. what least energy an incident alpha particle must have to penetrate the gold nucleus.

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