Combining two sounds of equal intensity will give a sound level __________ higher than the sound level due to just one of them
Fill in the blank(s) with correct word
3 dB
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The force of gravity is the only one of the four forces felt on large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The strong and weak forces act only on small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. B) The other three forces are all short in range, and cannot be felt over large distances. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
What causes stars to twinkle?
A) It is intrinsic to the stars—their brightness varies as they expand and contract. B) variations in the absorption of the atmosphere C) variable absorption by interstellar gas along the line of sight to the star D) bending of light rays by turbulent layers in the atmosphere E) the inability of the human eye to see faint objects
In gravitational red shift, the quantity that undergoes a red shift is
A) spacetime curvature. B) wave direction. C) field intensity. D) wave frequency. E) none of the above
When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.)
a. It is open at both ends. b. It is closed at both ends. c. It is open at one end and closed at the other end. d. Any of the above could be true.