Which of the following is not one of the three major categories of galaxies?
A) globular galaxies
B) elliptical galaxies
C) spiral galaxies
D) irregular galaxies
A) globular galaxies
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An object is placed 10 cm in front of a concave mirror with a 20-cm focal length. Determine the image location (in cm)
a. ?20 b. ?15 c. ?10 d. ?5 e. 6.7
What information does 21-cm radiation provide about the gas clouds?
A) their motion B) their density C) their temperature D) their distribution E) all of the above
Two objects with indices of refraction n1 and n2 are placed in the same liquid substance and have their critical angles measured. If experiment shows that ?c1 > ?c2, then it must also be true that
1. n1 < n2. 2. n1 > n2. 3. n1 = n2. 4.more must be known to determine the relationship between n1 and n2.
Estimate the maximum rotational energy (in electron-volts) for a free and freely-spinning diatomic hydrogen molecule in the L = 2 quantum state
The equilibrium separation for the atoms in the H2 molecule is 0.075 nm. (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s) A) 0.044 eV B) 0.011 eV C) 0.022 eV D) 0.033 eV