The range of frequencies that a radio telescope is sensitive to is referred to as its
A) sensitivity
B) band
C) bandwidth
D) bandpass
B
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A single-slit diffraction pattern is formed on a distant screen. Assuming the angles involved are small, by what factor will the width of the central bright spot on the screen change if the slit width is doubled?
A) It will be cut to one-quarter its original size. B) It will be cut in half. C) It will double. D) It will become four times as large. E) It will become eight times as large.
Earth and the Moon are attracted to each other by gravitational force. The more-massive Earth attracts the less-massive Moon with a force
1) less than the force that Moon exerts on Earth. 2) greater than that of the force that Moon exerts on Earth. 3) the same as that of the force that Moon exerts on Earth. This is in accord with 4) the law of inertia. 5) Kepler's Laws. 6) the conservation of energy. 7) the fact that both Moon and Earth orbit about a common point, the center of mass. 8) the law of action and reaction.
At what angle above the horizon would the sun appear if its reflected light from a lake, viewed at the same time, were completely polarized? (n water = 1.333)
A. 53.12 
B. 36.88 
C. 48.75
D. 41.25
E. 23.52
Series/Parallel Circuits: A 4.0-? resistor is connected with a 12-? resistor and both of these are connected across an ideal dc power supply with voltage V as shown in the figure. If the total current in this circuit is I = 2.0 A, what is the current through the 4.0-? resistor?
A. 2.0 A B. 2.5 A C. 0.5 A D. 3.0 A E. 1.5 A