Which of the following is not a unit of pressure?
a. atmosphere
b. psi
c. N/m2
d. mm of mercury
e. pascal
f. none of the above
Indicate whether the statement is true or false
F
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When using 545-nm light, how far is the adjustable mirror of a Michelson interferometer moved when 200 fringe shifts are counted?
a. 1.36 × 10^–6 m b. 2.73 × 10^–5 m c. 5.45 × 10^–5 m d. 1.36 × 10^–4 m e. 2.7 × 10^–4 m
A doorbell has an input voltage of 120 V. A transformer that steps the voltage down to 12 V has 500 turns on its primary. What is the number of turns on the secondary?
Seyfert galaxies are ________.
A. isolated black holes emitting radio waves B. bright elliptical galaxies C. spiral galaxies whose nucleus is abnormally luminous D. small irregular galaxies E. None of these choices is correct.
Buoyancy: A steel ball sinks in water but floats in a pool of mercury, which is much denser than water. Where is the buoyant force on the ball greater?
A. floating on the mercury B. submerged in the water C. It is the same in both cases. D. It cannot be determined from the information given.