What is the energy of a photon of wavelength 500 nm? Use h = 6.63 x 10^-34 J s and c = 3.00 x 10^8 m/s.
Answer and explanation
Correct answer: C. 3.98 x 10^-19 J
- Step 1: E = hc / wavelength = (6.63 x 10^-34 x 3.00 x 10^8) / (500 x 10^-9). Step 2. E = 3.98 x 10^-19 J. Answer: 3.98 x 10^-19 J. Why not the others: 3.98 x 10^-28 J leaves the wavelength in nanometres, 9.95 x 10^-32 J multiplies by the wavelength instead of dividing, and 1.99 x 10^-25 J is hc without dividing by the wavelength.
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