What is the photon energy of red light having a wavelength of 6.40 × 10² nm? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s) A)1.13 × 10^-¹⁹ J B)1.31 × 10^-19 J C)3.11 × 10^-19 J D)1.94 × 10^-19 J

Question

Quizplus · Accepted Answer

We can use the formula E = hc/λ to find the energy of a photon with wavelength λ. 
Substituting the given values, we get:
E = (6.626 × 10^-34 J ∙ s)(3.00 × 10^8 m/s)/(6.40 × 10^-7 m)
E = 3.11 × 10^-19 J

Therefore, the photon energy of red light having a wavelength of 6.40 × 10^-7 nm is 3.11 × 10^-19 J. This matches with option C.

What Is the Photon Energy of Red Light Having a Wavelength