According to the laws of thermal radiation, hotter objects emit photons with ________
A) a higher average speed B) a lower average energy
C) a lower average frequency D) a shorter average wavelength
D
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If a blackbody is at 2000° C, what will be the peak wavelength emitted?
a. 1.67 mm c. 0.679 mm b. 1.28 mm d. 1.45 mm
Three masses, 1.0 kg, 2.0 kg, and 3.0 kg, are located at (0.0 m, 0.0 m), (1.0 m, 1.0 m), and (2.0 m, -2.0 m), respectively. What is the location of the center of mass (or center of gravity) of this system?
A) (1.3 m, 0.67 m) B) (1.3 m, -0.67 m) C) (-1.3 m, 0.67 m) D) (-1.3 m, -0.67 m)
The total electromagnetic power emitted by the Sun is 3.8 ×1026 W. What is the radiation pressure near the orbit of Mercury, which has an orbital radius of 5.8 × 1010 m?
A) 3 × 10-5 N/m2 B) 3 × 10-7 N/m2 C) 3 × 10-8 N/m2 D) 3 × 10-4 N/m2 E) 3 × 10-6 N/m2
What do astronomers mean when they say that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that Earth formed at the same time as the Sun C) that the carbon, oxygen, and many elements essential to life were created by nucleosynthesis in stellar cores D) that the Sun formed from the interstellar medium: the "stuff" between the stars E) that the Universe contains billions of stars