How many times greater is the speed of red light (? = 700 nm) than the speed of violet light (? = 400 nm) in a vacuum?
a. 1.75 , the first color of light is faster
b. 0.57 , the second color of light is faster
c. 3.00 × 10^8 , the first color of light is faster
d. 1.00 , both colors of light have the same speed
e. 3.00 × 10^8 , the second color of light is faster
d
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To determine the orbital period of a visual binary, we must measure
a. brightness. b. position on the sky. c. wavelengths. d. luminosity. e. temperature.
If the Universe is infinitely large, infinitely old, and expanding, the night sky should be bright. But in fact, it is not. What do we call this?
A. Olbers' paradox B. Grand Unified Theory C. the Neutrino Discrepancy D. the Cosmological Principle E. the Hubble Distance law
How many grams of ice at -13°C must be added to 711 grams of water that is initially at a temperature of to produce water at a final temperature of
Assume that no heat is lost to the surroundings and that the container has negligible mass. The specific heat of liquid water is 4190 J/kg ? °C and of ice is 2050 J/kg · °C. For water the normal melting point is 0.00°C and the heat of fusion is 334 × 103 J/kg. The normal boiling point is 100°C and the heat of vaporization is 2.26 × 106 J/kg. What will be an ideal response?
Europa is most likely made of
A) pure water ice B) rock and water ice C) rock and iron D) pure rock