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DopplerShift:TheHb(hydrogenbeta)line,whichisstronginthespectraof moderately hot stars, has a wavelength of 486.133 nm in the laboratory (i.e., at rest...

DopplerShift:TheHb(hydrogenbeta)line,whichisstronginthespectraof moderately hot stars, has a wavelength of 486.133 nm in the laboratory (i.e., at rest with respect to the observer). What wavelength (nm) would we observe the Hb line on Earth if it were emitted by a star:
a) moving at a speed of 200 km/s toward Earth?
b) moving at a speed of 300 km/s away from Earth?

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Answer #1

As the source approaches the wave length decreases, and it increases when the source goes away

O v.1e pave, λ= 496.133 nm 1- 2o km/sec 6.133 Ihen he cok le e 486.133 m s(1 t 0.001)4x6133 m

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