# Can you calculate the energy of a photon of wavelength 11.56 meters, (Planck’s constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s)?

The energy of the photon is $1.718 \times {10}^{- 26} \text{J}$.
The energy of the photon is $1.718 \times {10}^{- 26} \text{J}$.
You use the formula E = (hc)/λ, where $h$ is Planck's Constant, $c$ is the speed of light, and $\lambda$ is the wavelength of the photon.
E = (hc)/lambda = (6.626 × 10^(-34)"J"*"s" xx 2.998 xx 10^8 "m"*"s"^(-1))/(11.56"m") = $1.718 \times {10}^{- 26} \text{J}$