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Chapter 36: Q. 38 (page 1060)
At what speed, as a fraction of c, must an electron move so that its total energy is 10% more than its rest mass energy?
The speed of electron is 0.417c.
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The radioactive element radium (Ra) decays by a process known as alpha decay, in which the nucleus emits a helium nucleus. (These high-speed helium nuclei were named alpha particles when radioactivity was first discovered, long before the identity of the particles was established.) The reaction is , where Rn is the element radon. The accurately measured atomic masses of the three atoms are , , and . How much energy is released in each decay? (The energy released in radioactive decay is what makes nuclear waste “hot.”)
An electron moving to the right atcollides with a positron moving to the left at. The two particles annihilate and produce two gamma-ray photons. What is the wavelength of the photons?
A laboratory experiment shoots an electron to the left at . What is the electron’s speed, as a fraction of c, relative to a proton moving to the right at ?
A starship blasts past the earth at . Just after passing the earth, it fires a laser beam out the back of the starship. With what speed does the laser beam approach the earth?
Through what potential difference must an electron be accelerated, starting from rest, to acquire a speed of ?
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