Using c=λν and e=hν (where h or planck’s constant is 6.626 *10 ⁻³⁴js). find the energy that a wavelength has if it has a wavelength of 3.000*10⁷ nm.

 The energy of wave if it has a wavelength of 3.0 × 10⁷ nm is 6.26 × 10⁻²⁴ J.

Attached below, is how to derive that answer.  Note that, E= Energy, λ = wavelength, h = Plank's Constant and C= speed of light

Also, I converted the wavelength from nm to cm.

Exothermic,  physical change after it is already baked