Questions from Modern Physics

Q: The probability of a photon interacting with tissue via the photoelectric effect

The probability of a photon interacting with tissue via the photoelectric effect or the Compton effect depends on the photon energy. Use Fig. P38.44 to determine the best description of how the photon...

Q: Higher-energy photons might be desirable for the treatment of certain

Higher-energy photons might be desirable for the treatment of certain tumors. Which of these actions would generate higher-energy photons in this linear accelerator? a. Increasing the number of elect...

Q: How much energy is imparted to one cell during one day’s treatment

How much energy is imparted to one cell during one day’s treatment? Assume that the specific gravity of the tumor is 1 and that 1 J = 6 * 1018 eV. a. 120 keV; b. 12 MeV; c. 120 MeV; d. 120 * 103 M...

Q: A tank whose bottom is a mirror is filled with water to

A tank whose bottom is a mirror is filled with water to a depth of 20.0 cm. A small fish floats motionless 7.0 cm under the surface of the water. a. What is the apparent depth of the fish when viewed...

Q: A 2.50-W beam of light of wavelength 124

A 2.50-W beam of light of wavelength 124 nm falls on a metal surface. You observe that the maximum kinetic energy of the ejected electrons is 4.16 eV. Assume that each photon in the beam ejects a phot...

Q: An incident x-ray photon of wavelength 0.0900 nm

An incident x-ray photon of wavelength 0.0900 nm is scattered in the backward direction from a free electron that is initially at rest. a. What is the magnitude of the momentum of the scattered photo...

Q: A photon with wavelength λ = 0.0980 nm is incident

A photon with wavelength λ = 0.0980 nm is incident on an electron that is initially at rest. If the photon scatters in the backward direction, what is the magnitude of the linear momentum of the elect...

Q: A photon with wavelength λ = 0.1050 nm is incident

A photon with wavelength λ = 0.1050 nm is incident on an electron that is initially at rest. If the photon scatters at an angle of 60.0° from its original direction, what are the magnitude and directi...

Q: A photon of wavelength 4.50 pm scatters from a free

A photon of wavelength 4.50 pm scatters from a free electron that is initially at rest. a. For ɸ = 90.0°, what is the kinetic energy of the electron immediately after the collision with the photon? W...

Q: Nuclear fusion reactions at the center of the sun produce gamma-

Nuclear fusion reactions at the center of the sun produce gamma-ray photons with energies of about 1 MeV (106 eV). By contrast, what we see emanating from the sun’s surface are visible light photons w...