Three photodiodes 
and 
are made of semiconductors having band gaps of 
, 
and 
respectively. Which one will be able to detect light of wavelength 
?
A
only
B
only C
both 
and 
and
D
All the three diodes
Text Solution
Verified by ExpertsThe correct answer is:
C
Given, 
;
We know that, energy, 
where 
(given)
Since 
is 
i.e., 
, and 
and 
are less than 
. Thus only diode 
can detect a light of wavelength 
.
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