When a large galaxy collides with a small galaxy, the smaller galaxy may be pulled apart by tidal forces
Indicate whether the statement is true or false
T
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Fourier discovered that periodic waves can be represented by
A) a series of non-periodic waves. B) the summation of a series of simple sine waves. C) a binary code. D) pulses of the same amplitude.
The Greeks rejected the notion that the Earth orbits the Sun. Why?
A) They could not measure how big the Earth was. B) They weren't as smart as we are. C) They could not measure a change in stars' positions on the sky. D) They believed that the Sun is a God.
The diameter of the average atom is about ______________ m
Fill in the blank(s) with correct word
Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?
a. 
b. 
c. 
d. 