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Chapter 39: Problem 32

A proton is made of 2 up quarks and a down quark (uud). Calculate its charge.

Short Answer

Expert verified
Answer: The charge of a proton is +1 elementary charge.

Step by step solution

01

Identify the charges of each quark

The charges of the quarks are: - Up quark (u): +2/3 elementary charge - Down quark (d): -1/3 elementary charge
02

Add the charges of the quarks in a proton

A proton has 2 up quarks (u) and 1 down quark (d). The total charge of a proton can be calculated as follows: Total charge = (Charge of up quark) * 2 + (Charge of down quark) * 1
03

Calculate the total charge of the proton

Total charge = (2/3) * 2 + (-1/3) * 1 = 4/3 - 1/3 = 3/3 = 1 elementary charge The charge of the proton is +1 elementary charge.

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Most popular questions from this chapter

Consider a hypothetical force mediated by the exchange of bosons that have the same mass as protons. Approximately what would be the maximum range of such a force? You may assume that the total energy of these particles is simply the rest-mass energy and that they travel close to the speed of light. If you do not make these assumptions and instead use the relativistic expression for total energy, what happens to your estimate of the maximum range of the force?

Some particle detectors measure the total number of particles integrated over part of a sphere of radius \(R\) from the target. Assuming symmetry about the axis of the incoming particle beam, use the Rutherford scattering formula to obtain the total number of particles detected as a function of the scattering angle \(\theta\).

An exchange particle for the weak force is the a) photon. b) meson. c) \(W\) boson. d) graviton. e) gluon.

a) Calculate the kinetic energy of a neutron that has a de Broglie's wavelength of \(0.15 \mathrm{nm}\). Compare this with the energy of an X-ray photon that has the same wavelength. b) Comment on how this would be relevant for investigating biological samples with neutrons vs. X-rays.

An electron-positron pair, traveling toward each other with a speed of \(0.99 c\) with respect to their center of mass, collide and annihilate according to \(e^{-}+e^{+} \rightarrow \gamma+\gamma\). Assuming the observer is at rest with respect to the center of mass of the electron-positron pair, what is the wavelength of the photons?
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