The angular resolution of an 8 inch diameter telescope is ________ times greater than that of a 2 inch diameter telescope
A) 8 B) 2 C) 16 D) 4 E) 9
D
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Which planetary fact(s) is(are) explained by the solar nebula theory?
a. The orbits are all approximately in the same plane b. The orbits are all in the same direction c. Jovian planets are mostly H and He d. Terrestrial planets are mostly rock and iron e. All of the other choices are correct.
What type of bond is(are) individually weakest?
a. hydrogen b. ionic c. covalent d. Hydrogen and covalent are equally weak. e. Ionic and covalent are both weaker than hydrogen.
An electron with kinetic energy 2.80 eV encounters a potential barrier of height 4.70 eV. If the barrier width is 0.40 nm, what is the probability that the electron will tunnel through the barrier?
(1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 3.5 × 10-3 B) 7.3 × 10-3 C) 1.4 × 10-2 D) 2.9 × 10-3 E) 3.5 × 10-2
Sonic Booms: A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A. 30° B. 36° C. 44° D. 46°