Suppose a starship had a mass of 1.25 x 109 kg and was initially at rest. If its “matter–antimatter engines” produced photons from electron–positron annihilation and focused them to travel backward out from the ship, how many photons would they have to emit to reach of the speed of light?
Answer to relevant QuestionsUsing a typical nuclear diameter of 4.25 x 10-15 as its location uncertainty, compute the uncertainty in momentum and kinetic energy associated with an electron if it were part of the nucleus. For energies greater than a few ...A proton and an electron are accelerated from rest through the same potential difference V. What is the ratio of the de Broglie wavelength of an electron to that of a proton (to two significant figures)? Using the general guidelines for nuclear stability, explain why aluminum has only one stable isotope (27Al). In other words, why aren’t isotopes of aluminum, such as 28Al or 26Al, stable? Theoretically, the tumor- killing efficiency of particle beams is much greater than that of a beam of X- rays or gamma rays. Explain why this is true. Actinium-227 decays by alpha decay or beta decay and is part of a long decay sequence, shown in Fig. 29.8. Write all the possible nuclear decays for the decay series from 227Ac to 215Po. Identify the daughter nucleus at the ...
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