A person receives an absorbed dose of protons of 20 millirads. The RBE of protons is 5. What is this person's equivalent dose in rem?
A) 100 millirem B) 25 millirem C) 15 millirem D) 4 millirem E) 20 millirem
A
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Approximately how large (across) is an impact crater compared to the size of the impactor?
A) the same size B) 10—20 percent larger C) 10 times larger D) 100 times larger E) 1000 times larger
Compared to the average surface temperature on the surface of the Earth, the average surface temperature on the surface of Mars is
A) about the same B) much lower C) just slightly lower D) much higher
Suppose that in a parallel universe, the proton and electron were identical to their counterparts in our own universe EXCEPT that the electron had twice as much charge as our electron. In our present universe,
the radius of the first Bohr orbit for hydrogen is a0 and the speed of an electron in that orbit is v0. In the parallel universe (a) what would be the radius (in terms of a0 ) of the first Bohr orbit for hydrogen? (b) what would be the speed (in terms of v0 ) of an electron in the first Bohr orbit for hydrogen?
An electron is moving at a speed of 4.8 × 10^6 m/s at an angle of 30.0° with respect to a uniform magnetic field of 9.2 × 10^–4 T. What is the radius of the resulting helical path? (me = 9.11 × 10^–31 kg, qe = 1.60 × 10^–19 C)
a. 2.6 cm b. 3.8 cm c. 5.5 cm d. 1.5 cm e. 2.9 cm