Light of wavelength 500 nm is incident on a thin sheet of plastic film (n= 1.50 ) in air. What is the thinnest the sheet can be so that the reflected light from the surfaces undergoes constructive interference?
A)
50 nm
B)
250 nm
C)
333 nm
D)
167 nm
E)
83 nm
E
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The helium fusion process works by fusing two helium nuclei into one beryllium nucleus
Indicate whether the statement is true or false
Europa has few craters because
a. it is protected from impacts by Jupiter's gravity. b. it does not have a solid surface. c. it has erased craters nearly as fast as they have formed. d. its surface is not strong enough to support craters. e. it keeps one face always pointed toward Jupiter which screens it from incoming meteorites.
A 1500 W portable heater is needed to replace the heat lost through a circular window in the wall of a home that is made of a single pane of glass 0.30 cm thick. Thermal conductivity for the glass is 0.63 W/mK. The temperature inside the house is 
and outside is 
What is the radius of the window?
A. 47 cm B. 53 cm C. 27 cm D. 7.1 cm E. 84 cm