By how much does the current fall after the switch is closed in a series RC circuit when three time constants have elapsed?
A. 5.0%
B. 38%
C. 62%
D. 95%
E. 100% since after 2 time constants the current is 0
D. 95%
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The energy required to excite a(n) _________energy electron to the energy of free space is called the work function.
Fill in the blank(s) with the appropriate word(s).
Why would a decrease in the density of the ozone layer create a public health concern?
a. The greenhouse effect would not be as efficient and the temperature of Earth would decrease. b. The greenhouse effect would be more efficient and the temperature of Earth would increase. c. Plant life would no longer have the ozone it needs for photosynthesis to create chlorophyll. d. Ultraviolet radiation from the Sun would bombard Earth. e. none of the above
A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because
A. no net force acts on the body. B. no force acts on the body. C. it is the nature of the body to slow down by itself. D. a net force acts on the body.
If three vectors add to zero, they must all have equal magnitudes
A) True B) False