What makes dark matter and dark energy so mysterious and so important?
A. We don't exactly know what they are, but they are the determining factors of the stellar evolution and planet formation.
B. We don't have strong evidence that they exist, but they could influence the motion of stars in Milky Way Galaxy.
C. We don't exactly know what they are, and they make up the majority of the total energy content of the universe.
D. We don't have strong evidence that they exist, and they could strongly influence the processes occurring in our Solar System.
Answer: C. We don't exactly know what they are, and they make up the majority of the total energy content of the universe.
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Index of Refraction: Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0. What is the frequency of the light in this liquid? (c = 3.0 × 108 m/s)
A. 12 × 1014 Hz B. 6.0 × 1014 Hz C. 3.0 × 1014 Hz D. 1.5 × 1014 Hz E. 2.0 × 1014 Hz
A certain ideal gas has a molar specific heat at constant pressure of 7R/2. What is its molar specific heat at constant volume?
A) 5R/2 B) 3R/2 C) 8R D) 9R/2 E) 6R
If a water sample contains 2 ppm of dissolved salt, it contains 2 g of salt in every ______________ g of water
Fill in the blank(s) with correct word
An image seen projected on a screen by a single lens is always inverted
Indicate whether the statement is true or false