Two metal rods are made of the same material and have the same cross-sectional area. The two rods differ only in their lengths which we call L and 3L, respectively
You heat the two rods from the same initial temperature to the same final temperature. You observe that the short rod expands its length by an amount ?L. The amount by which the length of the long rod will expand must be A) ?L.
B) ?L.
C) 2?L.
D) 3?L.
E) 9?L.
D
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Which one of the following objects is most like the planetesimals that formed in the solar nebula?
a. asteroids b. Earth c. Saturn d. Venus e. the sun
Energy Levels: The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 122 nm B. 203 nm C. 243 nm D. 389 nm E. 411 nm
If Earth's mass decreased to one-half its original mass with no change in radius, your weight would
A) decrease to one-quarter. B) decrease to one-half. C) remain the same. D) none of the above
Two electromagnetic waves are traveling at the same speed. The wave with the higher wavelength
A) has a higher frequency than the other wave. B) has a lower frequency than the other wave. C) is traveling faster than the other wave. D) is traveling slower than the other wave.