The standard model of particle physics predicts the existence of three families of elementary particles with four particles in each family. All of these particles have been confirmed experimentally except for the tau neutrino. Most physicists think the reason it has not been found is that
A. it likely does not exist.
B. it is associated with the tau particle and the tau is difficult to trap.
C. no current particle accelerator can generate enough energy to create a tau neutrino.
D. neutrinos are very difficult to detect.
Answer: D
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Nuclear Fission and Fusion: What is the meaning of the term "critical mass" in regard to nuclear fission?
A. This is the mass of the "critical" elements in a reactor, i.e., the uranium or plutonium. B. This is the minimum amount of fissionable material required to sustain a chain reaction. C. This is the amount of mass needed to make a power reactor economically feasible. D. This is the amount of material that is just on the verge of becoming radioactive.
Organic molecules are
A) carbon-based. B) silicon-based. C) living cells. D) found only on Earth. E) not found outside our solar system.
The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system. b. inelastic collisions between particles within the system. c. changes of momentum of individual particles within the system. d. internal forces acting between particles within the system. e. external forces acting on particles of the system.
When a diffraction grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 367 nm B) 183 nm C) 138 nm D) 637 nm