Concept explainers
(a)
The electric forces on the electron and on the proton.
(a)

Answer to Problem 126P
The electric force on the electron is
Explanation of Solution
Write the equation for the magnitude of the electric force using Coulomb’s law.
Here,
Conclusion:
The value of
Substitute
The force on electron will be toward the proton and the force on proton will be toward the electron.
Therefore, the electric force on the electron is
(b)
The electron’s acceleration and speed.
(b)

Answer to Problem 126P
The electron’s acceleration is
Explanation of Solution
The electric force is the net force acting on the electron.
Write the equation for the net force.
Here,
Rewrite the above equation for
The net force provides the centripetal force for the motion of the electron.
Write the equation for the centripetal force on the electron.
Here,
Equate equations (II) and (IV) and rewrite it for
Conclusion:
The mass of electron is
Substitute
Substitute
Therefore, the electron’s acceleration is
(c)
The minimum amount of energy required to ionize the atom if it stars in the ground state.
(c)

Answer to Problem 126P
The minimum amount of energy required to ionize the atom if it stars in the ground state is
Explanation of Solution
The minimum energy required to ionize the atom will be equal to the total energy of the atom. The total energy of the atom is the sum of the kinetic energy of the electron and the electric potential energy of the atom.
Write the equation for the total energy of atom.
Here,
Write the equation for
Write the equation for
Conclusion:
Substitute
Substitute
Substitute
Therefore, the minimum amount of energy required to ionize the atom if it stars in the ground state is
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Chapter 17 Solutions
PHYSICS
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