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A sound source approaches a stationary observer. The frequency heard by the observer is

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A secondary rainbow occurs when sunlight refracts into a water droplet and then has two internalreflections before refracting back into the air. The sketch shows the paths of a red and violet ray oflight, but it's not given which is which, only that the index of refraction of water is slightly higher forviolet than it is for red. Which color appears along the inner radius of the secondary rainbow?a) redb) violetc) it may be either red or violet depending on which direction the secondary rainbow is viewed fromd) secondary rainbows lead to merely a pot of silver

Violet light of wavelength 400 nm in air is incident along a normal line to a plane of glass (n=1.50)that has a 120 nm thick transparent coating, with an index of refraction somewhere between 1.55 and2.0. There appears to be no reflected light to an observer above. What is the index of refraction of thecoating?a) 1.57b) 1.67c) 1.77d) 1.87e) 1.97

A ray of sunlight has an incident angle of 50° when it encounters a glass window with index ofrefraction n=1.5. There is air with index n=1 on both sides of the window and the window surfaces areparallel. Which statement below is true?a) The light is 100 percent reflected at the first interface.b) The light is 100 percent reflected at the second interface.c) Light emerges on the other side of the window traveling parallel to the incident ray.d) Light emerges on the other side of the window but different colors now travel in different directions.e) Light emerges on the other side and is now 100% polarized parallel to the window.

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