Problem: A lithium flame has a characteristic red color due to emission of light of wavelength 671 nm. What is the mass equivalence of 1 mol photons with this wavelength (1 J = 1 kg⋅m2/s2)?

FREE Expert Solution

E = hvE = hcλE = (6.626×10-34 J·s)(3.00×108 ms)671 nm ×10-9 m1 nm

E= 2.9624x10-19 J


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A lithium flame has a characteristic red color due to emission of light of wavelength 671 nm. What is the mass equivalence of 1 mol photons with this wavelength (1 J = 1 kg⋅m2/s2)?

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