Enter the maximum kinetic energy (J) and the electron charge ( C) into the Calculator. The calculator will evaluate the Stopping Voltage.
Stopping Voltage Formula
SV = KE/e
Variables:
- SV is the Stopping Voltage (volts)
- KE is the maximum kinetic energy (J)
- e is the electron charge ( C)
To calculate Stopping Voltage, divide the maximum kinetic energy by the electron charge.
How to Calculate Stopping Voltage?
The following steps outline how to calculate the Stopping Voltage.
- First, determine the maximum kinetic energy (J).
- Next, determine the electron charge ( C).
- Next, gather the formula from above = SV = KE/e.
- Finally, calculate the Stopping Voltage.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
maximum kinetic energy (J) = 45
electron charge ( C) = 20
FAQ
What is the significance of stopping voltage in physics?
Stopping voltage is crucial in physics, particularly in the study of the photoelectric effect, as it represents the minimum voltage required to stop the most energetic photoelectrons emitted from a material’s surface. This helps in determining the maximum kinetic energy of these electrons and thus provides insights into the energy levels and quantum nature of electrons in atoms.
How does the electron charge affect the calculation of stopping voltage?
The electron charge is a fundamental constant in the calculation of stopping voltage, acting as the denominator in the formula. Since the stopping voltage is directly proportional to the maximum kinetic energy of an electron and inversely proportional to its charge, a higher electron charge would result in a lower stopping voltage for a given kinetic energy.
Can the stopping voltage be negative?
Typically, stopping voltage is considered in terms of magnitude, which is always positive, as it refers to the energy needed to halt electrons. However, in practice, the polarity of the stopping voltage depends on the direction of electron flow, where a negative stopping voltage implies that the applied voltage opposes the electron flow towards the anode.
Why is it important to calculate the stopping voltage in electronic devices?
Calculating the stopping voltage is crucial in designing and operating electronic devices, such as photovoltaic cells, vacuum tubes, and sensors. It helps in understanding and controlling the flow of electrons, optimizing the efficiency of devices, preventing over-voltage damage, and ensuring the proper functioning of electronic components by managing their energy levels.
