When light goes from one medium to another medium with a different index of refraction, which of the following do (does) NOT change?
A. the speed
B. the wavelength
C. the frequency
D. the speed and the wavelength
E. the frequency and the wavelength
C. the frequency
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A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere that is insulated from ground. It is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance
After the rod is separated, the rod A) is repelled by the sphere. B) is attracted to the sphere. C) feels no force due to the sphere.
The Great Red Spot on Jupiter is ________.
A. a largo tornado sweeping the planet from north to south B. a large rising cloud of gas C. a planetesimal impact site D. a giant vortex that has persisted for over 300 years
What is the period of a signal that has a frequency of 60 Hz?
a. 60 s c. 1/60 s b. 60 s-1 d. not determinable
Most asteroids are very regular in shape with bright surfaces
a. True b. False Indicate whether the statement is true or false