If the lifetime of a particle is roughly inversely proportional to the relative strength of the force involved, then for the strong, electromagnetic, and weak forces, arrange the forces according to their resulting lifetimes ranging from shortest to longest lifetimes
a. strong, electromagnetic, weak
b. weak, electromagnetic, strong
c. weak, strong, electromagnetic
d. strong, weak, electromagnetic
a
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Suppose that at a certain time a quanton has a well-defined position x = 0.15 nm. At that time, we perform an experiment to determine the quanton’s momentum, and find it has a value that corresponds to a de Broglie wavelength of 0.45 nm to a high degree of precision. What can we say about the quanton’s position after the experiment?
A. It is still 0.15 nm. B. It is now 0.45 nm. C. It is now within ±0.45 nm of 0.15 nm. D. It is now undefined but probably close to 0.15 nm. E. It is now completely undefined. F. Other (specify).
A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
Fraunhofer lines are apparent in
A) absorption spectra. B) emission spectra. C) Doppler shifts. D) a variety of energy levels. E) none of the above
Which of the following particles are leptons? (There may be more than one correct choice.)
A) protons B) neutrons C) electrons D) photons E) quarks