An electron follows a circular path (radius = 15 cm) in a uniform magnetic field (magnitude = 3.0 G). What is the period of this motion?
a. 0.12 ?s
b. 1.2 ms
c. 0.18 ?s
d. 1.8 ms
e. 1.8 ?s
a
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In the double-slit experiment with light, suppose that the light source is turned on so briefly that only a single quantum of energy passes through the double slits. When it arrives at the screen, this energy is deposited
A) all over the white interference bands that normally appear in the double-slit experiment. B) at one small point, which could be anywhere on the screen. C) at one small point within the white interference bands. D) all over one of the white interference bands. E) at one small point, lying directly behind the slit through which the energy came.
If there were no gravity, a cannonball fired upward at 45° would follow a straight-line path. Due to gravity, however, at the end of 3 s it is
A) 5 m below the straight line. B) 10 m below the straight line. C) 15 m below the straight line. D) 20 m below the straight line. E) more than 20 m below the straight line.
If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be
A) 3.0 m/s2. B) 2.2 m/s2. C) 1.0 m/s2. D) We cannot tell from the information given.
The atmospheric gases primarily responsible for our greenhouse effect are
A) carbon monoxide and methane. B) hydrogen and helium. C) oxygen and carbon dioxide. D) water vapor and carbon dioxide. E) argon and water vapor.