The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an emission spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
B
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The speed of light in vacuum is
A. smaller than the speed of light in glass B. the same as the speed of light in glass C. greater than the speed of light in glass
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
a. negative y direction b. positive y direction c. negative z direction d. positive z direction e. negative x direction
The oldest evidence of life on Earth dates back to about how many years ago?
a. 65 million b. 3.8 million c. 3500 million d. 570 million
The Earth's largest ocean is the
A) Atlantic. B) Pacific. C) Arctic. D) World Ocean—there is one big ocean taking up three-quarters of the world!