Roughly how many different elements are there?
A) 1000
B) 20
C) many more than 1000
D) 100
E) 4
D
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Notice the numbered points on this diagram of a reflecting telescope. Which point represents the place where the starlight is in focus?
A) Point 1 B) Point 2 C) Point 3 D) None of the listed choices is correct. This telescope has no focus because there is a hole in the primary mirror.
Describe some of the features of Mercury's surface and briefly explain how these features are believed to have formed
What will be an ideal response?
What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?
A) 5% B) 10% C) 1.5% D) 1% E) 25%
Entropy is a measure of the _____ of a system
a. disorder c. heat b. temperature d. internal energy