An electron is held up against the force of gravity by the attraction of a fixed proton some distance above it. How far above the electron is the proton?
A) 1.5 m
B) 2.3 m
C) 3.7 m
D) 4.6 m
E) 5.1 m
E
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If we were to intercept a strong radio signal at 1420 MHz in binary format from another civilization, this would be an example of
A) a signal used for communication between a civilization's home world and another planet in its own planetary system B) a signal used for local communication in the world where the intelligent beings exist C) an intentional signal beacon D) a signal used for communication between a civilization's home world and another star system
The distance traveled by a wave during a single period is
A) one-half wavelength. B) one wavelength. C) two wavelengths. D) none of the above
An object is being acted upon by three forces and moves with a constant velocity. One force is 60 N along the x-axis, the second is 75 N along the y-axis. What is the direction of the third force, measured counterclockwise from the x-axis?
A) 128° B) 182° C) 213° D) 225° E) 231°
In a Young's double-slit interference apparatus, by what factor is the distance between adjacent light and dark fringes changed when the wavelength of the source is doubled?
a. 1/4 b. 1/2 c. 1 d. 2 e. 4