A camera used for aerial surveillance has a lens with a 30-cm maximum aperture and a 42-cm focal length
Assume light of 550-nm wavelength is used and that the resolution of the camera is limited solely by diffraction. What is the angular resolution of the camera at maximum aperture?
A) 2.2 µrad B) 1.6 µrad C) 6.3 µrad D) 3.2 µrad E) 4.5 µrad
A
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Solenoid: Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings. If the length of the solenoid becomes twice as long (to 2L), but all other quantities remained the same, the magnetic field inside the solenoid will
A. remain the same. B. become twice as strong as initially. C. become one-half as strong as initially. D. become four times as strong as initially. E. become one-fourth as strong as initially.
1.0 micrometer equals _____________ millimeters.
a. 
b. 
c. 
d. 
Inside the nucleus, the strongest of the four fundamental forces is
A) the gravitational force. B) the weak nuclear force. C) the electromagnetic force. D) the strong nuclear force.
Seasons here are Earth are a result of
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.