The Bohr radius of the hydrogen atom is 0.529 × 10-10 m. What is the radius of the n = 2 state?
A) 0.265 × 10-10 m
B) 4.23 × 10-10 m
C) 1.06 × 10-10 m
D) 2.12 × 10-10 m
E) 0.529 × 10-10 m
D
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The number of degrees of freedom of a rigid diatomic molecule is:
A. 2 B. 3 C. 4 D. 5 E. 6
If a planet takes 140 years to orbit its host star, how far is it in units of A.U.?
What will be an ideal response?
Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of more than 3 million solar masses. C) It is a source of bright radio emission. D) It is a source of X-ray emission that we have observed with telescopes in space.
Which of the lines in the figure represents the normal to the surface at point P?
 a. 1 b. 2 c. 3 d. 4 e. none of the above