17. What is the de Broglie wavelength of a neutron that has fallen in a vacuum chamber, starting from rest?
The de Broglie wavelength of the neutron that has fallen in a vacuum chamber is
the de Broglie wavelength of a neutron that has fallen in a vacuum chamber,
The neutron has traveled through the gravitational potential energy difference of
where . This potential energy difference is converted into neutron's kinetic energy, so
We also know that the kinetic energy is related to momentum through
De Broglie wavelength is then simply given by
Remember that , and that the mass of the neutron is . With these numerical values we get
a. Explain why the graphs of Figure 38.3 are mostly horizontal for ∆V > 0.
b. Explain why photoelectrons are ejected from the cathode with a range of kinetic energies, rather than all electrons having the same kinetic energy.
c. Explain the reasoning by which we claim that the stopping potential Vstop indicates the maximum kinetic energy of the electrons
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