Helium was first discovered in the
A) laboratory.
B) upper atmosphere.
C) Sun.
D) island of Helios, in Greece.
E) byproducts of nuclear fusion.
Answer: C
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The graph in the figure shows the position of an object as a function of time. The letters H-L represent particular moments of time. At which moments shown (H, I, etc.) is the speed of the object (a) the greatest? (b) the smallest?
What will be an ideal response?
The energy for n = 4 and ? = 2 state is greater than the energy for n = 5 and ? = 0 state
Indicate whether the statement is true or false
When a blinking light source moves relative to you, the speed of the light
A) changes but the frequency of blinks remains constant. B) remains constant but the frequency of blinks can change. C) stays the same, as does the blinking frequency.
A method of expressing the accuracy of measured quantities is
a. metric prefixes. b. derived units. c. significant figures. d. conversion factors.