Chapter 25: Q. 5 (page 709)
What is the potential energy of the electron-proton interactions in FIGURE EX25.5? The electrons are fixed and cannot move.

Short Answer
The potential energy of electron proton interaction is
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Chapter 25: Q. 5 (page 709)
What is the potential energy of the electron-proton interactions in FIGURE EX25.5? The electrons are fixed and cannot move.

The potential energy of electron proton interaction is
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shows three points near two point charges. The charges have equal magnitudes. For each part, rank in order, from most positive to most negative, the potentials to .

One form of nuclear radiation, beta decay, occurs when a neutron changes into a proton, an electron, and a neutral particle called a neutrino: where is the symbol for a neutrino. When this change happens to a neutron within the nucleus of an atom, the proton remains behind in the nucleus while the electron and neutrino are ejected from the nucleus. The ejected electron is called a beta particle. One nucleus that exhibits beta decay is the isotope of hydrogen , called tritium, whose nucleus consists of one proton (making it hydrogen) and two neutrons (giving tritium an atomic mass ). Tritium is radioactive, and it decays to helium:
a. Is charge conserved in the beta decay process? Explain.
b. Why is the final product a helium atom? Explain.
c. The nuclei of both have radii of . With what minimum speed must the electron be ejected if it is to escape from the nucleus and not fall back?
The electric field strength is inside a parallel-plate capacitor with a spacing. An electron is released from rest at the negative plate. What is the electron’s speed when it reaches the positive plate?
A Van de Graaff generator is a device for generating a large electric potential by building up charge on a hollow metal sphere. A typical classroom-demonstration model has a diameter of .
a. How much charge is needed on the sphere for its potential to be?
b. What is the electric field strength just outside the surface of the sphere when it is charged to ?
A 1.0-mm-diameter ball bearing has excess electrons.
What is the ball bearing’s potential?
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