Malika is writing an essay about the sun. below is the first paragraph in the essay. the sun is an average-size star that is located at the center of the solar system. this hot, glowing ball of gas has a diameter of 1,393,000 km. this means 109 earths would fit side by side across the diameter of the sun. at the surface, the sun’s temperature is about 550 degrees celsius. earth is located just under 150 million kilometers from the sun. malika quickly realizes this paragraph contains an error. which statement identifies the error?

the sun is a large star, not an average-size star.
the sun is not a glowing ball of gas—it is solid.
the sun’s surface temperature is about 5500 degrees celsius.
earth is located over 300 million kilometers from the sun.

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.