COLLEGE PHYSICS
COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 28, Problem 33QAP
To determine

(a)

The kinetic energy of the proton

Expert Solution
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Answer to Problem 33QAP

Kinetic energy of the proton and antiproton =0.312GeV

Explanation of Solution

Given:

Total energy is =2.5GeV=2.5×109eV

Mass of the proton and antiproton are equal that is mp=1.67×1027Kg

Formula used:

  E=mc2

Calculation:

  E=mpc2=(1.67×1027)(3×108)=1.503×1010J

Convert Joules into eV

  1.503×1010J=1.503×1010J×1eV1.6×1019J=9.38×108eV

  E=mpc2+mpc2+Kp+KpE=2mpc2+2Kp

  Kp=E2mpc22

  =2.5×1092( 9.38× 108 c2)c22=3.12×108eV=0.312GeV

Conclusion:

Kinetic energy of the proton and antiproton =0.312GeV

To determine

(b)

The kinetic energy of the proton with 1.25 more kinetic energy than antiproton

Expert Solution
Check Mark

Answer to Problem 33QAP

Kinetic energy of the proton and antiproton =0.312GeV

Explanation of Solution

Given:

Total energy is =2.5GeV=2.5×109eV

Mass of the proton and antiproton are equal that is mp=1.67×1027Kg

Formula used:

  E=mc2

Calculation:

  E=mpc2=(1.67×1027)(3×108)=1.503×1010J

Convert Joules into eV

  1.503×1010J=1.503×1010J×1eV1.6×1019J=9.38×108eV

  E=mpc2+mpc2+1.25Kp+KpE=2mpc2+2.25Kp

  Kp=E2mpc22.25

  =2.5×1092( 9.38× 108 c2)c22.25=2.77×108eV=0.277GeV

Conclusion:

Kinetic energy of the proton and antiproton =0.312GeV

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A cyclotron is a machine that can be used to accelerate charged particles to achieve large kinetic energies.  The resulting beams of highly energetic particles then can be used for many medical applications, including Proton Therapy (a more precise form of "radiation" used in the treatment of some cancers).     A description of the cyclotron can be found in section 19.3 of the text.  If a proton (of mass 1.673x10-27kg) is accelerated to its maximum velocity inside a dee with radius 2.08cm (this is the radius you would use for the "r" term in the centripetal acceleration), and if the magnetic field has a magnitude of 2.44x10-2T, what is the resulting velocity of the proton in units of km/s (kilometer per second)?
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