Respuesta :

scme1702
Applying Planck's equation:

E = nhc/λ, with n = number of photons, h = Planck's constant, c = speed of light and λ = wavelength

2.5 x 10⁻¹⁷ = (6.63 x 10⁻³⁴)(3 x 10⁸)n / (9.8 x 10⁻⁷)
n = 123 photons

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