Electrons are more successfully ejected from photosensitive surfaces by
A. high-frequency light.
B. low-frequency light.
C. both about equally
D. none of the above
Answer: A
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The theory of plate tectonics is a result of the marriage of: a. continental drift and seafloor spreading
b. seafloor spreading and subduction. c. continental drift and subduction. d. seafloor spreading and transform faulting.
The depletion of stratospheric ozone is primarily a problem only in urban areas
Indicate whether the statement is true or false
Water covers ________ percent of Earth's surface.
A. 17 B. 71 C. 29 D. 78 E. 50
Which properly describes surface winds within the Tropics?
A. winds blowing from northeast to southwest in the northern hemisphere, winds blowing southeast to northwest in the southern hemisphere B. winds blowing from southwest to northeast in the northern hemisphere, winds blowing northwest to southeast in the southern hemisphere C. winds blowing from northwest to southeast in the northern hemisphere, winds blowing southwest to northeast in the southern hemisphere D. inconsistent winds, called the doldrums which last for most of the year