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The energy gap of silicon is 1.14 eV. Th...

The energy gap of silicon is `1.14 eV`. The maximum wavelength at which silicon will begin absorbing energy is

A

1086 Å

B

10860 Å

C

10.86 Å

D

108.6 Å

Text Solution

Verified by Experts

The correct Answer is:
B
`because E=hv="hc"/lambda`
`therefore lambda_"max"="hc"/lambda=(6.6xx10^(-34)xx3xx10^8)/(1.14xx1.6xx10^(-19)) `
`=(6.6xx3)/(1.14xx1.6)xx10^(-7) m`
`=10.86xx10^(-7)xx10^10` Å = 10860 Å
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