20 - (Optional) Quantum Physics

20 - (Optional) Quantum Physics - 33 years. Physics 8B 20...

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Physics 8B 20 – (Optional) Quantum Physics rev 4.0 20 – (Optional) Quantum Physics 1) What is the direction of the external magnetic field in the diagram below? Explain. Lead plate e+ Gamma rays e- 2) What does the infinite range of the electromagnetic and gravitational interactions tell you about the masses of the photon and the graviton? Explain. 3) When you jump off a building why do you stop falling at the footpath rather than continuing through to the center of the earth? Explain in terms of gravitational and the electromagnetic forces.
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Physics 8B 20 – (Optional) Quantum Physics rev 4.0 4) Measurements taken at the Super Kamiokande neutrino detection facility in Japan indicate that the half-life of protons is at least 10 33 years. a) Estimate how long we would have to watch, on average, to see a proton in a glass of water decay. b) The Super Kamiokande neutrino facility contains 50,000 tons of water. Estimate the average time between detected proton decays if the half-life is 10
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Unformatted text preview: 33 years. Physics 8B 20 (Optional) Quantum Physics rev 4.0 5) Suppose a claim is made that the decay of the neutron is given by n p + e-. Which of the following conservation laws are violated by this proposed decay representation? Explain your reasoning for each law. a) Energy; b) Linear momentum; c) Angular momentum; d) Electric charge; e) Lepton number; f) Baryon number. Physics 8B 20 (Optional) Quantum Physics rev 4.0 6) a) Atoms did not exist until hundreds of thousands of years after the Big Bang. Why? b) Observations of other galaxies show that they are moving away from us. Is it therefore correct to propose that we are at the center of the Universe? c) A quasar is a highly luminous object that is very distant from the Earth. Its speed can be measured from Doppler shift measurements in the light it emits. A certain quasar recedes from the Earth at a speed of 0.55c. How far away is it?...
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This note was uploaded on 09/28/2009 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at University of California, Berkeley.

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20 - (Optional) Quantum Physics - 33 years. Physics 8B 20...

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