In a Young's experiment, the paths from the slits to a point on the screen differ in length, causing destructive interference at the point. Which of the following path difference would cause this destructive interference?
a. 5?/2
b. 3?/4
c. 4?
d. None of the above.
a
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Lenses can be used to focus sunlight to a small point to burn paper or dry brush. A person demonstrates this using their own eyeglasses as the lenses. From this you can tell that
A. the person is either near- or farsighted but not both. B. the person is farsighted. C. the person is both near- and farsighted. D. the person is nearsighted.
Most of Earth's fresh water is located in
A) polar ice caps and glaciers. B) groundwater. C) rivers, lakes, and streams. D) the atmosphere.
Forces of 8 N and 3 N act on an object. If the two forces act in opposite directions, the net force on the object is
A) 8 N. B) zero. C) 11 N. D) 5 N. E) impossible to determine.
Black hole jets are believed to be focused and confined by the enclosing magnetic _______________
Fill in the blank(s) with correct word