PH 102 Final: ph102_Sum10_final_answers
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Final exam answers relevant to summer 2014 exam 2: relativity, quantum, atomic (choose 3 of 4) (cid:3) 1. In a scattering experiment to reveal the atomic-scale structure of a material, electrons are accelerated through a potential di erence of v = 500 kv. Solution: the potential di erence gets you potential energy, potential energy change equals kinetic energy change. Kinetic energy gets you momentum, momentum gets you wavelength. Solution: the possible photon energies are the possible energy di erences, 9. 36 4. 16 = 5. 2 ev, 4. 16 1. 04 = 3. 12 ev, 9. 36 1. 04 = 8. 32 ev. (cid:3) 3. A muon is formed from a cosmic ray shower in the upper atmosphere at an altitude of 1 km. Name & cwid (c) if you ignored relativity, would it reach the surface of the earth? (cid:3) 4. The kinetic energy of an electron is increased by a factor of two. If kinetic energy doubles, wavelength must decrease by a factor 2. h p h.
