Which of these is the same for all forms of electromagnetic (E-M) radiation in a vacuum?
A) photon energy
B) amplitude
C) speed
D) wavelength
E) frequency
C
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Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?
A) charge = +2; number of remaining electrons = 6 B) charge = +2; number of remaining electrons = 8 C) charge = ?2; number of remaining electrons = 10 D) charge = +2; number of remaining electrons = 2
Which uranium isotope has the largest cross section for slow neutrons?
A) U-236 B) U-238 C) U-237 D) U-235 E) U-239
Inferring cloud properties using carbon-monoxide: At the low temperatures of molecular clouds, carbon monoxide emits radio light more strongly than does molecular hydrogen
What assumptions must be made to then use observations of carbon monoxide to infer the properties of the cloud as a whole?
An electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass. This pair annihilation is an example of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.