A light-year is the distance light travels in one year
a. True
b. False
Indicate whether the statement is true or false
True
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A(n) _______________ occurs when the Moon moves between Earth and the Sun
Fill in the blank(s) with correct word
The intensity of the sound wave from an airplane is
at 5.0 m. What is the intensity at 100 m?
A. 0.25 
B. 0.53 
C. 5.0
D. 0.25 
Compared to its average speed in air, the average speed of a beam of light in glass is
A) more. B) less. C) the same.
An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz