Consider a hypothetical particle physics scenario where a newly discovered particle puyon moves to the right at 0.85c, and its antiparticle (anti-puyon) moves to the left at the same speed. Upon collision, they annihilate each other and produce four gamma-ray photons (equal energies). Determine the wavelength of these photons. The rest mass of a puyon (or anti-puyon) is approximately 1.53 × 10 ^-27 kg.