Why do nuclear fusion reactions only take place in the interior of a star?
a. The magnetic fields are strongest there.
b. The temperature is the hottest in the center.
c. The density of material is very high in the center.
d. The temperature is the hottest in the center and the density of material is very high in the center.
e. FALSE; Nuclear fusion reactions can take place in the core and corona where temperatures are high enough.
d
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An innovative physics professor conducts laboratory exercises in the college swimming pool. Suppose that one exercise was the measurement of the degree of polarization by bouncing laser light off a surface of glass. If the glass used has an index of refraction of 1.52, at what angle of incidence will the reflected beam be perfectly polarized? It will help to recall that the index of refraction of water is 1.33.
A. 
B. 
C. 
D. 
A star is on the horizontal branch of the H-R diagram. Which statement is true?
A) It is burning only helium. B) The star is contracting. C) The star is about to return to the main sequence. D) It is about to experience the helium flash. E) It is burning both hydrogen and helium.
When using an eyepiece of focal length f, the Yerkes refracting telescope gives a magnification of 800 . What focal length eyepiece would yield a magnification of 500?
a. (8/5)2f b. (5/8)f c. (8/5)f d. (5/8)2f
The fundamental frequency of HF is 8.72 × 10^13 Hz. The energy associated with a transition from the 10th to the 9th vibrational quantum number (in eV) is
a. 3.61 b. 0.361 c. 0.060 5 d. 0.605 e. 0.182