Photon frequency in different inertial frames

[MHD93]

Do we measure different frequencies of light in frames moving relatively at constant velocities?

Because when we look at an annihilation reaction from the view of different frames, we see different energies of the reactants which seem to affect the frequency of the produced photons.

your kind responses are appreciated

 

[VantagePoint72]

Do we measure different frequencies of light in frames moving relatively at constant velocities?

Yes, it's called a Doppler shift (or, for sufficiently fast velocities, a relativistic Doppler shift).

 

[Naty1]

and it is analogous to a sound signal which when the source approaches you seems to change 'tone' [frequency or wavelength] as the source passes you...the observed frequency changes duo to relative motion.