A body in a room at 300 K is heated to 3,000 K. The amount of energy radiated each second by the body increases by a factor of
a. 10
b. 100
c. 1,000
d. 10,000
e. 100,000
D
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The centers of granules
a. are hot material rising to the photosphere from below. b. are cool material falling from the photosphere to the regions below. c. are fainter and hotter than their surroundings. d. are brighter and cooler than their surroundings. e. show strong Zeeman effects.
Gravitational Potential Energy: A projectile is shot straight up from the surface of Earth by means of a very powerful cannon and experiences no appreciable air resistance. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon? (G = 6.67 × 10-11 N ? m2/kg2, the radius of Earth is 6.38 × 106 m, and Mearth = 5.97 ? 1024 kg)
A. 355 m/s B. 505 m/s C. 827 m/s D. 710 m/s E. 906 m/s
The surface of Comet 67P/CG as detected by the Rosetta mission is best described as
A) smooth with parallel striations. B) smooth with many hilly areas. C) rough with cracks and crevices. D) rough with many craters.
Compton Scattering: X-rays with a wavelength of 0.00100 nm are scattered at 130° by free electrons. What is the kinetic energy of each recoil electron? (1 eV = 1.60 × 10-19 J, melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 0.50 MeV B. 0.99 MeV C. 2.0 MeV D. 0.34 MeV E. 0.68 MeV