The Doppler shift, describing the way in which the wavelength λo of light emitted by...?

Question

... by a moving object is detected as a different wave length λ by a stationary observer (with v the object velocity and c the velocity of light) is given by...

a) (λ-λo)/λo = v/c

b) λ x λo = vc

c) λ - λo = (v - c)

d) λ/λo = v/c

a, b c or d?

Answer 1

What is Wikipedia, Alex?
http://en.wikipedia.org/wiki/Doppler_shift