Modern Physics Ques 224
- The temperature dependence of resistances of $Cu$ and undoped $Si$ in the temperature range $300-400$ $ K$, is best described by
(2016 Main)
(a) linear increase for $Cu$, linear increase for $Si$
(b) linear increase for $Cu$, exponential increase for $Si$
(c) linear increase for $Cu$, exponential decrease for $Si$
(d) linear decrease for $Cu$, linear decrease for $Si$
Show Answer
Answer:
Correct Answer: 224.(c)
Solution:
Formula:
- As, we know $Cu$ is conductor, so increase in temperature, resistance will increase. Then, $Si$ is semiconductor, so with increase in temperature, resistance will decrease.
BETA
