Oceanographer Bob Ballard, famous for his discovery of the Titanic on the floor of the Atlantic Ocean, used the deep diving submersible Alvin to examine the wreckage for the National Geographic Society. If you used a 1/8 scale model in water at 60oF to evaluate drag characteristics, what model velocity should be used in tests to correspond to a current of 15 knots in liquid water near 32oF

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.