State which of the following statement is not valid/ true for the below mentioned networks.

The noise temperature represented in terms of actual physical temperature and one-sided positive bandwidth is not valid/ true for which of the below mentioned networks ?

a. Networks possessing active devices for signal amplification
b. Networks possessing shot & atmospheric noise
c. Both (a & b)
d. None of the above.

Correct Answer : c. Both (a & b)

Explanation :

Noise temperature is independent of actual physical temperature since it takes into consideration the temperature for controlling noisy resistor that generates similar available noise power at the output of the network.