CUET Preparation Today
The gap between the valence and conduction bands of a certain semiconductor is 0.85 eV. When this semiconductor is used to form a light emitting diode, the wavelength of the light emitted. |
is in a range above $1.5×10^{-6}m$ is in a range below $1.5×10^{-6}m$ is always $1.5×10^{-6}m$ is in a range centered on $1.5×10^{-6}m$. |
is in a range below $1.5×10^{-6}m$ |
$\lambda_{max} = \frac{hc}{E} = \frac{12400 A^o}{0.85} = 1.5 \mu m$ $\lambda \text{ is less than }1.5 \mu m$. |
