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The maximum wavelength of electromagneti...

The maximum wavelength of electromagnetic radiation, which can create a hole-electron pair in germanium. (Given that forbidden energy gap in germanium is 0.72 eV)

A

172220 Å

B

172.2 Å

C

17222 Å

D

1722Å

Text Solution

Verified by Experts

The correct Answer is:
C
`E_g="hc"/lambda_"max"`
`therefore lambda_"max"="hc"/E_g="12400 eV"/"0.72 eV" Å = 17222 Å`
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