Which of the following statement is true for a wavelength of 1000 nm. A p-n photodiode is fabricated from a semiconductor with band gap of 1.9 eV.
1
The photodiode can detect signal once the energy of signal is increased.
2
The energy of a signal of given wavelength is more than the specified band gap
3
The photodiode can easily detect signal
4
The photodiode cannot detect signal