Explain the meaning of temperature
Temperature is a measure of how hot or cold an object is, or more specifically,
temperature is proportional to the average kinetic energy of the molecules that make
up the object.
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Why does the image show very few stars?
A: It is hard to find stars in the Milky Way Galaxy, so it would have been too difficult to select a region that had many. B: Stars are only visible in radio waves, and the Hubble Deep Field image was taken in the optical region of the spectrum. C: Stars are only visible in the optical region of the spectrum, and the Hubble Deep Field image was taken with a radio telescope. D: It was chosen so that bright stars in the Milky Way Galaxy do not interfere with our picture of the distant universe. E: The scientists were interested seeing the light of galaxies through a region of space filled with black holes.
X-rays of wavelength 0.080 nm are used in a Bragg scattering experiment with a crystal. If the first order maximum is found at a grazing angle of 
what is the plane spacing in the crystal?
A. 0.31 nm B. 0.71 nm C. 1.4 nm D. 0.38 nm E. 0.77 nm
The fundamental force that is the principal cause of what we experience as frictional forces is:
A. gravitational force B. electromagnetic force C. weak force D. strong force
Near the earth the intensity of radiation from the sun is 1.35 kW/m2. What volume of space in this region contains 1.0 J of electromagnetic energy? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 4.5 × 10-6 m3 B) 3300 m3 C) 7.4 × 10-4 m3 D) 1400 m3 E) 220,000 m3