Molecular Speeds: At what temperature would the root-mean-square speed of hydrogen, H2, molecules equal 11.2 km/s (the earth's escape speed)? The mass of a hydrogen atom is 1.67 × 10-27 kg, and the Boltzmann constant is 1.38 × 10-23 J/K.
A. 1.01 × 102 K
B. 1.01 × 104 K
C. 1.01 × 106 K
D. 1.01 × 108 K
Answer: B
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Nickel and silver have lattice parameters of 0.352 nm and 0.408 nm, respectively; an electronegativity of 1.8 for each, an FCC structure, and a similar valence. Should they be able to form a continuous-solid solution? _____________
Fill in the blank(s) with the appropriate word(s).
How deep is an impact crater compared to its width?
A) 1-10% B) 50-100% C) 30-40% D) 10-20% E) 100-200%
A very small source of light that radiates uniformly in all directions produces an electric field amplitude of 2.96 V/m at a point 33.0 m from the source
What is the power output from the source? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
Kepler's third law, p2 = a3, means that
A) a planet's period does not depend on the eccentricity of its orbit. B) all orbits with the same semimajor axis have the same period. C) the period of a planet does not depend on its mass. D) planets that are farther from the Sun move at slower average speeds than nearer planets. E) All of the above are correct.