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

Answer

8654 Å

Explanation

Energy
`E_(min)=(hc)/(lamda_(max))`
`becauselamda_(max)=(hc)/(E_(min))`
`=(6.6xx10^(-34)xx3xx10^(8))/(1.43xx1.6xx10^(-19))m`
`=8.654xx10^(-7)m`
`=8654xx10^(-10)m`
`=8654Å`