A thin film of magnesium fluoride (n = 1.38) is applied to glass (n = 1.50) at a thickness of 100 nm. For what visible wavelength will this coating act as nonreflecting?
A. 600 nm
B. 578 nm
C. 552 nm
D. 504 nm
E. 491 nm
C. 552 nm
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The electric potential inside a charged solid spherical conductor in equilibrium
A. is always zero. B. is constant and equal to its value at the surface. C. decreases from its value at the surface to a value of zero at the center. D. increases from its value at the surface to a value at the center that is a multiple of the potential at the surface. E. is equal to the charge passing through the surface per unit time divided by the resistance.
Each of two small non-conducting spheres is charged positively, the combined charge being 40 ?C. When the two spheres are 50 cm apart, each sphere is repelled from the other by a force of magnitude 2.0 N. Determine the magnitude of the smaller of the two charges.
A. 1.4 ?C B. 1.1 ?C C. 2.0 ?C D. 3.3 ?C E. 17 ?C
Suppose you discovered a meteorite that contains small amounts of potassium-40, which has a half-life of 1.3 billion years, and its decay product argon-40
You determine that 1/16 of the original potassium-40 remains; the other 15/16 has decayed into argon-40. How old is the meteorite? Based on your answer, where is this meteorite probably from?
Although some photographs show what looks like jets of material near many young stars, we now know that these "jets" actually represent gas from the surrounding nebula that is falling onto the stars
Indicate whether the statement is true or false