A student attaches a length of nylon fishing line to a fence post. She stretches it out and shakes the end of the rope in her hand back and forth to produce waves on the line. The most efficient way for her to increase the wavelength is to
a. increase the tension on the hose and shake the end more times per second.
b. decrease the tension on the hose and shake the end more times per second.
c. increase the tension on the hose and shake the end fewer times per second.
d. decrease the tension on the hose and shake the end fewer times per second.
e. keep the tension and frequency the same but increase the length of the hose.
c
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If the magnetic field from a current-carrying long straight wire has a magnitude 
at a distance d, what is the magnitude of the field at a distance 2d?
A. also 
B. 0.707
C. 0.693
D.
/2
E. 
/4
Liquid crystal displays make use of interference of light
a. True b. False Indicate whether the statement is true or false
The moon's distance from Earth is measured very accurately by bouncing a laser beam off of a small mirror left on the surface of the moon. If a laser is fired at the moon and the signal returns in 2.6 seconds, what is the distance to the moon?
a. 390,000 km b. 390,000 m c. 780,000 km d. 780,000 m
What is the name of constellations that appear to never rise or set?
a. polar constellations b. circumference constellations c. circular constellations d. celestial polar constellations e. circumpolar constellations