Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

50. 

The minority carrier life time and diffusion constant in a semiconductor material are respectively 100 microsecond and 100 cm2/sec. The diffusion length is

[A]. 0.1 cm
[B]. 0.01 cm
[C]. 0.0141 cm
[D]. 1 cm

Answer: Option A

Explanation:

Diffusion length = .


Thiru said: (Apr 9, 2014)  
Please explain using formula?

Prakash said: (Aug 25, 2015)  
(100*100)/1000000 = 1/100.

Under root of 1/100 1/10 = 0.1 cm.

Saleem said: (Jul 23, 2017)  
I think the answer is 1cm.

Sayan said: (Jul 29, 2017)  
L=(D.T)^1/2 [ D=The diffusion coefficient, L=diffusion length, T= specific life time).
Here T=100 Sec = 10^(-4) sec.
and D=100 cm^2/sec.

Now L=(10^2/ 10^4)^(1/2)= (1/10) = 0.1 cm.

Surekha said: (Aug 27, 2018)  
Explain in detail.

Sean said: (Jan 21, 2021)  
√(100x10^-6 x 100)= 0.1cm.

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