Chapter 28, Problem 64A

To determine

To calculate: The maximum kinetic energy of the electron in joules.

Answer to Problem 64A

Kinetic energy = $\underset{\_}{\text{1}\text{.2}\times {\text{10}}^{-18}\text{ J}}$

Explanation of Solution

Given:

Potential Energy = $7.3\text{ V}$

Formula used:

Kinetic energy is given by,

  $E=qV$

Where $q$ is charge of an electron and $V$ is potential.

Calculation:

Kinetic energy in joules is calculated as:

  $\begin{array}{l}E=qV\\ =\left(\frac{1.60\times {10}^{-19}\text{ J}}{1\text{ eV}}\right)\left(7.3\text{ eV}\right)\\ \text{ =1}\text{.2}\times {\text{10}}^{-18}\text{ J}\end{array}$

Conclusion:

Kinetic energy = $\underset{\_}{\text{1}\text{.2}\times {\text{10}}^{-18}\text{ J}}$