Alana drew a diagram to compare the life cycles of low-mass and high-mass stars. which labels belong in the areas marked x, y, and z? a.) x: nuclear fusion forms hydrogen in the main sequence star. y: a white dwarf is part of the cycle. z: a supernova is part of the cycle. b.) x: a white dwarf is part of the cycle. y: nuclear fusion forms hydrogen in the main sequence star. z: a supernova is part of the cycle. c.) x: a protostar is part of the cycle. y: it begins in a nebula. z: nuclear fusion forms hydrogen in the main sequence star. d.) x: it begins in a nebula. y: nuclear fusion forms hydrogen in the main sequence star. z: a protostar is part of the cycle.

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.