Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be (x/8) ev. The value of X is : 

(1) 15 

(2) 11 

(3) 13 

(4) 21

                                            JEE-2024         

Solution:                
Conductivity of a photodiode starts changing

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