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Chapter 37: Q. 10 (page 1081)
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.
The momentum ofPAis greater than the momentum ofPB.
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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 .
An alpha particle (a bare helium nucleus with) acceler-ates across a potential difference, starting from rest. What is the particle鈥檚 kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.
11. An alpha particle (a bare helium nucleus with ) accelerates across a potential difference, starting from rest. What is the particle鈥檚 kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.
Once Thomson showed that atoms consist of very light negative electrons and a much more massive positive charge, why didn鈥檛 physicists immediately consider a solar-system model of electrons orbiting a positive nucleus? Why would physicists in object to such a model?
Thomson observed deflection of the cathode-ray particles due to magnetic and electric fields, but there was no observed deflection due to gravity. Why not?
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