# Calculating Bethe Stopping Power Constant: 606,235 or 78,500?

• John2
In summary, the Bethe Stopping Power Constant is a value used in physics to calculate the energy loss of a charged particle as it travels through a material. The two commonly used values for this constant are 606,235 and 78,500, with the former being more accurate but the latter being easier to calculate.
John2
The nonrelativistic Bethe stopping power function contains the constant 2*pi*N*e^4 where N is Avogadro's number and e is the electron charge. In the literature, this constant is often calculated to be 78,500. If calculate the constant, I get 606,235 (=2 * pi * 6.02214179E+23 mol^-1 *(1.602176487E-19 C)^4). Does anybody know what my mistake is?

Thank you.

Thank you. That helped.

## 1. What is the Bethe stopping power constant?

The Bethe stopping power constant is a numerical value that represents the energy loss per unit distance traveled by a charged particle passing through a material. It is used in calculations to determine the energy loss of particles in various materials.

## 2. How is the Bethe stopping power constant calculated?

The Bethe stopping power constant is calculated using the Bethe-Bloch formula, which takes into account the properties of the material and the particle, such as the atomic number, density, and velocity. It is a complex mathematical formula that requires specialized knowledge in physics and mathematics to understand and apply.

## 3. Is the Bethe stopping power constant a constant value?

No, the Bethe stopping power constant is not a constant value. It can vary depending on the material and particle being considered. For example, the constant for electrons passing through water would be different from the constant for protons passing through lead.

## 4. What is the significance of the values 606,235 and 78,500 in the Bethe stopping power constant?

The values 606,235 and 78,500 are commonly used approximate values for the Bethe stopping power constant for electrons and protons, respectively, passing through water. These values are based on experimental data and are used as a reference in calculations involving these particles and materials.

## 5. Why is calculating the Bethe stopping power constant important?

Calculating the Bethe stopping power constant is important in various fields of science, such as nuclear physics, medical physics, and materials science. It allows us to understand and predict the energy loss of particles passing through different materials, which is crucial in many applications, such as radiation therapy, particle accelerators, and radiation shielding.

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