What determines the "pitch" of a musical note?
A)
amplitude
B)
wavelength
C)
frequency
D)
phase
E)
intensity
C
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What happens when a battery is recharged?
a. The negative charge is turned around and made into a positive charge again. b. The cells are turned around and connected in the opposite direction. c. An electric charger runs current backward through the battery and reverses the chemical reactions. d. The electrolyte is poured out and replaced. e. Electric charge is pumped back into the battery to be released again when the charge is used.
The Galactic Disk has been flattened by the ________ of the Galaxy
Fill in the blank(s) with correct word
A laser emits monochromatic and coherent light
Indicate whether the statement is true or false
An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead