Athick glass window (n = 1.5) is coated with a thin layer of transparent material (n = 1.4). what is the minimum thickness of this coating such that when viewed along a line perpendicular to the coated glass, it appears red-orange (wavelength in vacuum = 560 nm)?

How can you increase the strength of an electromagnet?

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is

What is the efficiency of an engine that does 80 j of work and exhausts 320 j of heat while taking in 400 j of heat ? a. 10% b. 20% c. 80% d. 25%