The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H( ), the corresponding noise figure is

The power density spectrum of noise voltage at the input of a network

1.	The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H( ), the corresponding noise figure is
A.	<img src="/_files/images/electronics-and-communication-engineering/communication-systems/502-156-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/communication-systems/502-156-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/communication-systems/502-156-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/communication-systems/502-156-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/502-156-2.png">