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A sodium light source moves in a horizon...

A sodium light source moves in a horizontal circle at a constant speed of 0.100c while emitting light at the proper wavelength of `lambda_(0)=589.00 nm`. Wavelength `lambda` is measured for that light by a detector fixed at the center of the circle. What is the wavelength shift `lambda-lambda_(0)`?

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The correct Answer is:
`+2.97nm`
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