A helium-neon laser (? = 632.8 nm) is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5°, what is the line spacing, d?
A. 1.81 × 10?6 m
B. 1.00 × 10?5 m
C. 1.00 × 10?4 m
D. 1.31 × 10?6 m
E. 6.76 × 10?7 m
Answer: A
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The Saturnian moons of most interest to exobiologists are
A) Rhea and Iapetus. B) Phoebe and Dione. C) Mimas and Tethys. D) Hyperion and Miranda. E) Titan and Enceladus.
When learning about light, we predicted that Venus should have a temperature of 250 K based on its albedo and distance from the Sun. Why is Venus's observed average surface temperature equal to 740 K, which is hot enough to melt lead?
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How would the atmospheric temperature structure differ from the generic structure if a planet had no greenhouse gases?
What will be an ideal response?
Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it
How far above the electron would the proton have to be? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg, melectron = 9.11 × 10-31 kg) A) 4.6 m B) 3.7 m C) 5.1 m D) 2.3 m E) 1.5 m