1) A firefly glows by the direct conversion of chemical energy to light. Suppose

Question

1) A firefly glows by the direct conversion of chemical energy to light. Suppose the light emitted by a firefly has peak intensity at a wavelength of 558 nm.

(a) What is the minimum chemical energy, in eV, required to generate each photon?

3)A slab of material of thickness 2.0 cm reduces the amount of radiation by a factor of 5.0. How much is the radiation reduced (from its original amount) if you use a 6.0 cm thickness of this material? (Answer by the factor by which it's reduced, so your answer should be > 1; e.g., if it's cut in 1/2, you would answer 2.)

Explanation / Answer

1.

the energy is calculated as follows:

E = hc/lambda = 1240 nm.eV / 558 NM = 2.22 eV

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