Which wavelength of the Sun is primarily used to generate electric energy in solar cells?

Statement $-I$: $A$ photodiode operates in reverse bias.
Statement $-II$: The fractional change due to the photo-effects on the minority carrier dominated reverse bias current is more easily measurable than the fractional change in the forward bias current.

In a light emitting diode $(LED)$,light is emitted due to:

State the band gap of the semiconductor used in the making of $LED$.

In a $p-n$ junction solar cell,the value of photo-electromotive force produced by monochromatic light is proportional to the

Which of the following semiconductor devices requires a reverse bias to operate?