Chapter 5: Problem 105
What is \(\gamma\) for a proton having a mass energy of 938.3 MeV accelerated through an effective potential of \(1.0 \mathrm{TV}\) (teravolt)?
Short Answer
Expert verified
The gamma factor for a proton having a mass energy of 938.3 MeV and accelerated through an effective potential of 1.0 TV is approximately \(2.10\).
Step by step solution
01
Calculate energy gained by the proton
First, we will calculate the energy gained by the proton due to the acceleration through the given potential. Using the given potential of 1.0 TV, we have:
\[E_{gained} = qV = (1.6 \times 10^{-19} C)(1.0 \times 10^{12} V)\]
\[E_{gained} = 1.6 \times 10^{-7} J\]
Now, convert the energy gained in joules to MeV:
\[E_{gained} = \frac{1.6 \times 10^{-7} J}{1.6 \times 10^{-13} J/MeV} = 10^{6} MeV\]
02
Calculate the total relativistic energy of the proton
Next, we will find the total relativistic energy of the proton, which is the sum of the initial mass energy and the gained energy:
\[E_{total} = E_{mass} + E_{gained} = 938.3 \mathrm{MeV} + 10^{6} \mathrm{MeV} = 10^{6} + 938.3 \mathrm{MeV}\]
03
Calculate momentum of the proton
Now we need to calculate the momentum of the proton. Solve for momentum in terms of energy using the following equation:
\[E_{total} = \sqrt{(mc^2)^2 + (pc)^2}\]
\[p = \frac{\sqrt{E_{total}^2 - (mc^2)^2}}{c}\]
Using the total relativistic energy and the mass of the proton:
\[p = \frac{\sqrt{(10^{6} + 938.3 \mathrm{MeV})^2 - (938.3 \mathrm{MeV})^2}}{c}\]
04
Calculate velocity of the proton
Now, we will calculate the velocity of the proton in terms of its momentum and mass:
\[v = \frac{pc}{m}\]
\[v = \frac{p}{(938.3 \mathrm{MeV}/c^2)}\]
\[v = \frac{\sqrt{(10^{6} + 938.3 \mathrm{MeV})^2 - (938.3 \mathrm{MeV})^2}}{(938.3 \mathrm{MeV}/c)}\]
05
Calculate the gamma factor
Finally, we will calculate the gamma factor using the formula:
\[\gamma = \frac{1}{\sqrt{1 - (v/c)^{2}}}\]
Plugging the velocity we got in the previous step:
\[\gamma = \frac{1}{\sqrt{1 - \left(\frac{\sqrt{(10^{6} + 938.3 \mathrm{MeV})^2 - (938.3 \mathrm{MeV})^2}}{(938.3 \mathrm{MeV}/c)} \right)^2 / c^2}}\]
Calculate the gamma factor:
\[\gamma \approx 2.10\]
There you have it! The gamma factor for a proton having a mass energy of 938.3 MeV and accelerated through an effective potential of 1.0 TV is approximately 2.10.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Relativistic Gamma Factor
The relativistic gamma factor, denoted as \(\gamma\), is a crucial concept in the realm of special relativity. It represents the factor by which time, length, and relativistic mass change for an object moving relative to an observer. The formula for the gamma factor is \(\gamma = \frac{1}{\sqrt{1 - (v/c)^2}}\), where \(v\) is the velocity of the object and \(c\) is the speed of light in a vacuum.
As an object's speed increases towards the speed of light, the gamma factor increases significantly, indicating substantial time dilation and length contraction. In our textbook exercise, we calculated the gamma factor for a proton accelerated to a significant fraction of the speed of light. Understanding this concept helps us comprehend how particles behave at high speeds, fundamental for applications such as particle accelerators and astrophysics.
As an object's speed increases towards the speed of light, the gamma factor increases significantly, indicating substantial time dilation and length contraction. In our textbook exercise, we calculated the gamma factor for a proton accelerated to a significant fraction of the speed of light. Understanding this concept helps us comprehend how particles behave at high speeds, fundamental for applications such as particle accelerators and astrophysics.
Proton Acceleration
Proton acceleration is a process used in physics to increase the energy and, consequently, the speed of protons. This is often achieved using electric fields, such as the teravolt potential mentioned in our exercise. When protons are accelerated through these high voltages, they gain kinetic energy. The energy gained can be calculated using the formula \(E_{gained} = qV\), where \(q\) is the charge of the proton and \(V\) is the potential difference.
Accelerating protons to high speeds enables us to observe relativistic effects and is a technique widely used in particle physics research, including in the Large Hadron Collider (LHC). By understanding how protons accelerate and the resulting energies involved, we delve into fundamental questions about matter and the universe.
Accelerating protons to high speeds enables us to observe relativistic effects and is a technique widely used in particle physics research, including in the Large Hadron Collider (LHC). By understanding how protons accelerate and the resulting energies involved, we delve into fundamental questions about matter and the universe.
Conversion of Energy Units
In physics, it's often necessary to convert between different units of energy. This is especially true when dealing with relativistic calculations, where energy can be described in terms of electron volts (eV) or joules (J). The conversion is straightforward with the use of conversion factors. 1 eV, which is the energy gained by an electron when it is accelerated through an electric potential of 1 volt, is equivalent to \(1.6 \times 10^{-19} J\).
In our exercise, we converted the energy gained by a proton, initially given in teravolts, to mega electron volts (MeV), which is a unit more commonly used in particle physics. This conversion allows for easier comparison of energy values when analyzing particle collisions or decays. Remembering these conversion factors, \(1\,\text{eV} = 1.6 \times 10^{-19} J\) and \(1\,\text{MeV} = 10^6\,\text{eV}\), is essential when performing energy calculations in the realm of high-energy and nuclear physics.
In our exercise, we converted the energy gained by a proton, initially given in teravolts, to mega electron volts (MeV), which is a unit more commonly used in particle physics. This conversion allows for easier comparison of energy values when analyzing particle collisions or decays. Remembering these conversion factors, \(1\,\text{eV} = 1.6 \times 10^{-19} J\) and \(1\,\text{MeV} = 10^6\,\text{eV}\), is essential when performing energy calculations in the realm of high-energy and nuclear physics.