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Red light has a wavelength of approximately 700 nm(which corresponds to a frequency of about 430 THz), while green light would be about 535 nm(frequency of 560 THz).

Doppler formula for the blueshift effect is:

f'=(c/(c+v)) * f, so we get:

v = c * ((f/f')-1)

v is radial speed from source to observer. Negative v indicates the velocity vector has to point towards source.

Calculating:

v = -0.232 c , which would be about 70000 km/s.

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