6. A neutron lives 900 s when at rest relative to an observer. How fast is the neutron moving relative to an observer wh
Posted: Mon May 16, 2022 7:39 pm
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Question 3 2 pts 24. If a galaxy moving away from the Earth has a speed of 1000 km/s and emits 656 nm light characteristic of hydrogen (the most common element in the universe). What wavelength (in nm) would we observe on the Earth? HINT: Use the relativistic doppler shift equation. Question 4 1 pts According to relativity, can a particle with mass move at the speed of light? HINT: What would be the momentum of a particle moving at the speed of light? No, because if v-Y-00, and thus its momentum would be infinitely high. Yes, because if v-,7-1, so at that point the momentum is the same as in classical physics,
Question 5 1 pts When putting together the relativistic energy and momentum you can find an expression for total energy that involves momentum, ke. E = (pc)2 + (me) Using the above equation, you can find an expression for the momentum of a photon, a massless particle!! What is the momentum of a photon? HINT: Remember that we know the energy of a photon from Plank's equation E=hf on Оры һfe ons Op = 1/2 Р ve OP ccess shboard
Question 6 2 pts 36. What is the momentum of an electron traveling at 0.980c? Give your answer in units of 10 21 kg m/s. HINT: Use m = 9.11x10-31 kg for the mass of the electron. D Question 7 2 pts 43. What is the rest energy of an electron, given its mass is 9.11x10-31kg? Give your answer in Mev. HINT: 1 MeV = 1.6x10-13 J
Question 8 2 pts 55. Beta decay is nuclear decay in which an electron is emitted. If the electron is given 0.750 MeV of kinetic energy, what is its velocity in units of c? D Question 9 2 pts 66. Suppose you use an average of 500 kW.h of electric energy per month in your home. How long would 1.00 g of mass converted to electric energy with an efficiency of 38.0% last you? Give your answer in years.