What is coherent light?
a. light of a single wavelength
b. light that is all in phase
c. light that is polarized in one direction
d. none of the above
B
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Identical point charges (+50 ?C) are placed at the corners of a square with sides of 2.0-m length. How much external energy is required to bring a fifth identical charge from infinity to the geometric center of the square?
A. 41 J B. 16 J C. 64 J D. 10 J E. 80 J
If a bullet is fired into a solid wooden block and comes out the other side, the collision was ________ inelastic.
What will be an ideal response?
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.
Both reflecting and refracting telescopes may use a lens called the eyepiece
Indicate whether the statement is true or false