First magnitude Spica appears 2.5 times brighter than second magnitude Polaris
Indicate whether the statement is true or false
TRUE
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If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration?
A) 1750 Hz B) 750 Hz C) 1500 Hz D) 250 Hz
Intensity: For an electromagnetic wave in free space having an electric field of amplitude E and a magnetic field of amplitude B, the ratio of B/E is equal to
A. c.
B. c2.
C. 1/c.
D. 1/c2.
E. 
.
What do Pioneer 10 and 11 and Voyager 1 and 2 all have in common?
What will be an ideal response?
If the frequency of the AC voltage across a capacitor is doubled, the capacitive reactance of that capacitor
A) decreases to one-fourth its original value. B) increases to 4 times its original value. C) decreases to one-half its original value. D) becomes zero. E) increases to twice its original value.