Question

how many photons of light with the wavelength of 4000pm are necessary to provide 1joule of energy?
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Answer 1

Answer:

After we know the energy of a single photon, we can find out how many it takes to get the total energy of the pulse (0.528 J). Wavelength, λ (lambda), times frequency, ν (nu), equals the speed of light. Energy of a single photon is the product of Planck's constant, h, and the frequency, ν. h = 6.63 x 10-34 J.