What is the energy of a photon whose momentum is 6 * 10 ^ 16 kg * m / s.

p = 6 * 10 ^ -16 kg * m / s.
s = 3 * 10 ^ 8 m / s.
E -?
The photon energy E is determined by the formula: E = h * c / λ, where h is a constant bar, c is the speed of light in vacuum, λ is the wavelength of the photon.
The photon momentum p is determined by the formula: p = h / λ.
E = p * c.
E = 6 * 10 ^ -16 kg * m / s * 3 * 10 ^ 8 m / s = 18 * 10 ^ -8 J.
Answer: photon energy E = 18 * 10 ^ -8 J.