The eyes of certain member of the repltile family pass a single visual signal to the brain when the visual receptors are stuck by photons of wavelength 13.6nm. If a total energy of 3×10−14 J is required to trip the signal, the minimum number of photons that must strike the receptor are:
20,000
22,000
25,500
30,000
A
20,000
B
22,000
C
25,500
D
30,000
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Solution
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Let n photon is required. E=nhv;n=3×10−146.6×10−34×3×10813.6×10−9=20,000
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