Pangaea is believed to have broken up about how many years ago?
a. 2000 million
b. 2 million
c. 20 million
d. 200 million
d
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Interference: What do we mean when we say that two light rays striking a screen are in phase with each other?
A. When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes. B. They are traveling at the same speed. C. They have the same wavelength. D. They alternately reinforce and cancel each other.
The speed of sound in helium is 965 m/s. If the density of helium is 
then what is the bulk modulus of helium?
A. 
B. 
C. 
D. 
E. 
The terrestrial planet with the oldest surface is ____________________
Fill in the blank(s) with correct word
Isolated bells ring clearly, while bells crammed in a box have a muffled ring. This is analogous to light emitted by
A) a laser. B) a fluorescent lamp. C) an incandescent lamp. D) a phosphorescent source. E) none of the above