By what amount does the intensity level increase when you triple the intensity of a source of sound?
A) 9.5 dB
B) 4.8 dB
C) 6.0 dB
D) 3.0 dB
E) 12 dB
B
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Length Contraction: A spaceship with a constant velocity of 0.800c relative to Earth travels to the star that is 4.30 light-years from Earth. What distance does the space ship travel as measured by a passenger on the ship?
A. 2.58 light-years B. 3.52 light-years C. 4.12 light-years D. 4.30 light-years
Four point charges are located at the corners of a square, 1.00 m by 1.00 m. On each of two diagonally opposite corners are 1.00 ?C charges. On each of the other two corners are - 1.00 ?C charges. What is the magnitude of the force on one of the positive charges?
a. 
b. 
c. 
d. 
e. 0.00
The path difference between two waves is 5 m. If the wavelength of the waves emitted by the two sources is 4 m, what is the phase difference (in degrees)?
A. 90 B. 400 C. 1.57 D. 7.85 E. 15
If an AA alloy’s numerical designation is followed by the letter “F”, this indicates that the alloy is as _________.
Fill in the blank(s) with the appropriate word(s).