Which one of the following symbols represents a photodiode?

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

$A$ $p-n$ junction photodiode is fabricated from a semiconductor with a band gap of $2.5 eV$. It can detect a signal of wavelength: (Given: Planck's constant $h = 6.6 \times 10^{-34} Js$,speed of light $c = 3 \times 10^8 m/s$,elementary charge $e = 1.6 \times 10^{-19} C$)

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

The laptop PCs,modern electronic watches,and calculators use the following for display:

In a $PN$ junction photocell,the value of the photo-electromotive force produced by monochromatic light is proportional to