Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to match the energy of a gamma-ray photon with energy 4.1 × 10-13 J? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A) 1.0 × 106
B) 1.4 × 108
C) 6.2 × 109
D) 3.9 × 103
A
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Tripling the separation between charges changes the potential energy of a pair of point charges by a factor of
A. 3. B. 9. C. 1/3. D. 1/9. E. 1 (no change).
That Polaris will not always be the pole star is due to:
A) the sidereal day being shorter than the solar day. B) precession shifting the celestial pole. C) the Moon following the ecliptic, instead of the equator. D) the Earth's revolution being slightly less than exactly 365.25 days. E) the Solar winds blowing the Earth farther away from the Sun.
In age, Population I stars are typically much ________ than those of Population II
Fill in the blank(s) with correct word
In relativity, two people share the same frame of reference only if
A) they are not moving relative to each other. B) they are both located in the same place. C) they are both located in the same place and are traveling at the same speed. D) they are both located in the same place and are stationary. E) they agree on the laws of nature.