How Many Revolutions Does a Proton Make in a Cyclotron?

In summary, the problem is asking for the number of revolutions a proton makes before leaving a 66.0-cm-diameter cyclotron with a 530 V oscillating potential difference between the dees. Using the equation f = (q*B)/(2*pi*m), the cyclotron frequency is calculated to be 1.1x10^7 rev/sec. To find the time it takes for the proton to leave the cyclotron, its speed and kinetic energy at the radius of the cyclotron must be determined. With each revolution, 2*530 eV is added to the proton's energy. Assuming the proton starts with negligibly small kinetic energy, the number of revolutions can be found by converting eV to Joules and
  • #1
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Homework Statement



A 66.0-cm-diameter cyclotron uses a 530 V oscillating potential difference between the dees.

How many revolutions does the proton make before leaving the cyclotron?

Homework Equations



f = (q*B)/(2*pi*m)

The Attempt at a Solution



I find the cyclotron frequency:

f = ((1.6x10^-19)(0.69))/(2*pi*(1.67x10^-27)) = 1.1x10^7 rev/sec

I don't know where to go from there. How do I find the time it takes for the proton to leave the cyclotron?
 
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  • #2
The proton will exit when it is at the radius of the cyclotron.
Can you find the proton's speed at that radius?
Can you find the proton's kinetic energy when it exits?
For every revolution, 2*530 eV are added to the proton's energy.
Put it together assuming that the proton starts with negligibly small kinetic energy. (Don't forget to convert eV to Joules).
 
  • #3


The time it takes for the proton to leave the cyclotron can be found by dividing the circumference of the cyclotron by the distance traveled by the proton in one revolution. In this case, the circumference can be calculated using the diameter given (66.0 cm), and the distance traveled by the proton can be calculated using the frequency found (1.1x10^7 rev/sec). This will give you the time it takes for the proton to complete one revolution. From there, you can use this time to calculate how many revolutions the proton will make in a given period of time (such as the time it takes for it to leave the cyclotron).
 

Related to How Many Revolutions Does a Proton Make in a Cyclotron?

1. What is the cyclotron frequency of a proton?

The cyclotron frequency of a proton is the frequency at which a proton moves in a circular path in a magnetic field. It is expressed in units of hertz (Hz) and is given by the equation f = qB/2πm, where q is the charge of the proton, B is the strength of the magnetic field, and m is the mass of the proton.

2. How is the cyclotron frequency of a proton calculated?

The cyclotron frequency of a proton can be calculated using the equation f = qB/2πm, where q is the charge of the proton, B is the strength of the magnetic field, and m is the mass of the proton. This equation is derived from the Lorentz force equation, which describes the force on a charged particle moving in a magnetic field.

3. What factors affect the cyclotron frequency of a proton?

The cyclotron frequency of a proton is affected by the strength of the magnetic field, the charge and mass of the proton, and the radius of the circular path. Additionally, the presence of other charged particles in the vicinity can also affect the cyclotron frequency through their interactions with the proton.

4. What is the significance of the cyclotron frequency of a proton?

The cyclotron frequency of a proton is significant because it is a fundamental property of the proton that is used in many scientific and technological applications. It is used in particle accelerators, mass spectrometers, and magnetic resonance imaging (MRI) machines, among others.

5. How does the cyclotron frequency of a proton differ from that of an electron?

The cyclotron frequency of a proton differs from that of an electron because the proton has a larger mass and a positive charge, while the electron has a smaller mass and a negative charge. This results in different values for their respective cyclotron frequencies, with the proton's being lower than that of the electron.

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