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Q.

Estimate how many photons of yellow light (λ = 575 nm) must be absorbed by 1.0 cm3 of human skin to raise the skin temperature by 1.0 °C. Assume that the photon energy is absorbed by 1.0 cm3 of tissue. As rough estimates of the tissue's density and specific heat, use the values for water.

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a

1.3 x 1019

b

1.1 x 1019

c

1.4 x 1019

d

1.2 x 1019

answer is D.

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Detailed Solution

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msT=E ; Vds T=nhcλn=VdsΔTλhc =10-6×103×4200×1×575×10-96.6×10-34×3×108 =1.2×1019

 

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