A beam of neutrons (m = 939.6 MeV/c2) of momentum 12 keV is passed through a single slit of width 0.10 nm. As a result of this, the neutron beam acquires an uncertainty in the component of the momentum that is transverse to the beam direction. If the distance between the slit and a projection screen onto which the neutrons are projected is 1.5 m, what is the expected width of the neutron distribution on the projection screen in the transverse direction?
A. 155 cm
B. 12 cm
C. 25 cm
D. 50 cm
C. 25 cm
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Radioactive Decay: How long would it take 4.00 × 1020 atoms to decay to 1.00 × 1019 atoms if their half-life was 14.7 years?
A. 29.4 years B. 58.8 years C. 78.2 years D. 147 years
Why do we call dark matter "dark"?
A) It blocks out the light of stars in a galaxy. B) It emits no radiation that we have been able to detect. C) It contains large amounts of dark-colored dust. D) It is dark brown or dark red in color.
Einstein proposed two basic principles or laws as the foundation of his special theory of relativity. One of these principles is intuitively plausible, while the other seems quite implausible or odd to our intuitions
The principle that is intuitively plausible is A) the principle of time dilation. B) the principle of inertia. C) the principle of relativity. D) the principle of the constancy of lightspeed. E) E=mc2.
The result of a particle meeting its antiparticle will most likely be
A. the creation of a "black hole." B. the release of quarks contained in each particle. C. the creation of a new particle with twice the mass of the original particles. D. annihilation of the two particles and the release of photons.