The wavelength of visible light for the green color is 600 ππ. The energy of photons of this color is _______ ππ (rounded off to one decimal place). (Planckβs constant = $6.63 Γ 10^{β34} π½π , 1 ππ = 1.6 Γ 10^{β19} π½$, speed of light = $3 Γ 10^8 ππ ^{β1}$)