Search any question & find its solution
Question:
Answered & Verified by Expert
A p-n photodiode is made of a material with a band gap of $2.0 \mathrm{eV}$. The minimum frequency of the radiation that can be absorbed by the material is nearly
Options:
Solution:
1787 Upvotes
Verified Answer
The correct answer is:
$5 \times 10^{14} \mathrm{~Hz}$
$p-n$ photodiode is a semiconductor diode that produces a significant current when illuminated. It is reversed biased but is operated below the breakdown voltage.
Energy of radiation $=$ band gap energy ie, $h v=2.0 \mathrm{eV}$
$$
\text { or } v=\frac{2.0 \times 1.6 \times 10^{-19}}{6.6 \times 10^{-34}} \approx 5 \times 10^{14} \mathrm{~Hz}
$$
Energy of radiation $=$ band gap energy ie, $h v=2.0 \mathrm{eV}$
$$
\text { or } v=\frac{2.0 \times 1.6 \times 10^{-19}}{6.6 \times 10^{-34}} \approx 5 \times 10^{14} \mathrm{~Hz}
$$
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.