If we could put all the asteroids together, their total mass would be ________
A) about the mass of Mercury
B) about the mass of Earth
C) greater than the mass of Earth but less than the mass of Jupiter
D) much less than the mass of any terrestrial planet
D
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The temperature scale where the numerical value is proportional to the average kinetic energy of the atoms or molecules is __________
Fill in the blank(s) with correct word
A floating leaf oscillates up and down twice in 1 s as a water wave passes by. What is the wave's frequency?
A) 0.5 Hz B) 1 Hz C) 2 Hz D) 3 Hz E) 6 Hz
Which of the following is not an observed characteristic of the cosmic microwave background?
A) It contains prominent spectral lines of hydrogen, the primary chemical ingredient of the universe. B) It has a perfect thermal radiation spectrum. C) Its temperature is the same everywhere, except for small variations at the level of 1 part in 100,000. D) Its temperature is a little less than 3 Kelvin (3 degrees above absolute zero).
How can the size of a quasar be measured?
What will be an ideal response?