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Chapter 37: Q. 13 (page 1082)
A cosmic ray travels through the earth鈥檚 atmosphere in, as measured by experimenters on the ground. How long does the journey take according to the cosmic ray?
t' = 346.4 micro sec
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Consider the lead isotope .
a. How many electrons, protons, and neutrons are in a neutralatom?
b. The lead nucleus has a diameter of . What is the electric field strength at the surface of a lead nucleus?
The Large Hadron Collider accelerates two beams of protons, which travel around the collider in opposite directions, to a total energy of per proton. ( teraelectron volt ) The beams cross at several points, and a few protons undergo headon collisions. Such collisions usually produce many subatomic particles, but in principle the colliding protons could produce a single subatomic particle at rest. (It would be unstable and would almost instantly decay into other subatomic particles.) What would be the mass, as a multiple of the proton's mass, of such a particle?
Particle A has half the mass and twice the speed of particle B. Is the momentum pA less than, greater than, or equal to pB? Explain.
Express in (or or if more appropriate):
a. The kinetic energy of an electron moving with a speed of .
b. The potential energy of an electron and a proton apart.
c. The kinetic energy of a proton that has accelerated from rest through a potential difference of .
Through what potential difference would you need to accelerate an alpha particle, starting from rest, so that it will just reach the surface of a 15-fm-diameter 238U nucleus?
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