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We start with two formulas; E = hf and f = c/λ
where:
E = Energy (eV)
h = Planck's Constant (6.626x10-34 (J-s))
f = frequency (Hz) of orange light at 650 nm
c = speed of light (3x108 m/s)
λ = wavelength of orange light (nm)
First, f = c/λ can be used to replace f in E=hf making the revised formula E = hc/λ;
Solve for E;
E = (6.626x10-34 * 3x108 ) / 650x10-9 = 3.0582x10-19 eV
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