Latest Activity In Study Groups

Join Your Study Groups

VU Past Papers, MCQs and More

We non-commercial site working hard since 2009 to facilitate learning Read More. We can't keep up without your support. Donate.

The topic is:

 “You have two materials, one is Metal and other is semiconductor. How the decrease in temperature affects the Metal conductivity and increase of temperature effects the conductivity of semiconductor.  Tell the scientific reason behind this effect of conductivity”

       Instructions about GDB are given below

  • Your answer should be concise and not exceed more than 150 words.
  • Don’t put duel entries, Post your answer only once.
  • Any one who found to be indulged in cheating will be graded zero marks.
  • No answer will be accepted through email after closing of GDB.

Please, inform all the students to take part in this discussion, other wise they will miss 5 marks.

Views: 456


Replies to This Discussion

Please Discuss here about this GDB.Thanks
Dear Students Don’t wait for solution post your problems here and discuss ... after discussion a perfect solution will come in a result. So, Start it now, replies here give your comments according to your knowledge and understandings....

The band gap in the metal is small and thus the electrons can easily take a leap to conduction band and conduct electricity but with increase in temperature, the thermal motion makes the electrons to collide and disturb the free flow. Thus, conductivity is decreased. However, with decrease in temperature, the thermal effect is nullified and the electrons can flow smoothly without hindrance and thus conductivity increases.
In semi conductors, the band gap is big but small enough for few electrons to take a leap to the conduction band and conduct electricity to some extent. However with increase in temperature they get charged with thermal energy which is sufficient to overcome the energy barrier and leap to the conduction band and thus, their conductivity increases.

enjoy and keep me in prayers............

conductivity of a material depends directly both on the number n of free electrons per unit volume and on the average time τ between collisions. As we increase temperature, average speed of the electrons, which act as the carriers of current, increases resulting in more frequent collisions. The average time of collisions τ, thus decreases with temperature which decreases conductivity of metals. In semiconductors the number of free electrons increases with increasing tempreture,thus increasing conductivity.

PHY301 - Circuit Theory GDB No. 1 Solution Fall 2015 Due Date Feb 04, 2016

Please Discuss here about this GDB.Thanks

Our main purpose here discussion not just Solution

We are here with you hands in hands to facilitate your learning and do not appreciate the idea of copying or replicating solutions.

I have obtained good marks in PHY301-GDB


© 2021   Created by + M.Tariq Malik.   Powered by

Promote Us  |  Report an Issue  |  Privacy Policy  |  Terms of Service