To think of electric potential difference we are thinking about
A) current.
B) voltage.
C) resistance.
Answer: B
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The uncertainty in the position of a proton is 250 pm. What is the minimum velocity of the proton when its position has been measured to this precision?
A. 0.29c B. 0.10c C. 0.39c D. 0.21c
How do we measure stellar masses?
A) We measure their apparent brightness and distance (from parallax). B) We don't really know: stellar masses are based on an informed guess. C) We measure the orbital periods and velocities of stars in binary systems. D) We measure their density and radius.
Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is
A) definitely less. B) often less. C) actually more. D) the same. E) incredibly, all of the above
On a day when the speed of sound in air is 340 m/s, what will be the wavelength of sound of frequency 227 Hz?
A. 0.67 m B. 1.5 m C. 0.33 m D. 3.0 m E. 227 m