•most of the galaxies in the universe are moving away from
earth. suppose a particular galaxy emits orange light with
a frequency of 5.00 * 1014 hz. if the galaxy is receding
from earth with a speed of 3325 km/s, what is the
frequency of the light when it reaches earth?
• a) 4.945 x 1014 hz
• b) 5.542 1012 hz
• c) 5.055 1014 hz

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Most of the volume of an atom is occupied by the

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.