Noise factor and noise figure

Q10. Noise Factor(F) and Noise Figure(NF) are related as

Options:

a) NF= 10 log₁₀(F)
b) F= 10 log₁₀(NF)
c) NF= 10 (F)
d) F= 10 (NF)

Correct Answer: a) NF= 10 log₁₀(F)

Explanation :

Noise figure (NF) and noise factor (F) signify the degradation of the signal-to-noise ratio (SNR) for any system due to components in a radio frequency (RF) signal . They give the performance of the system.The noise factor of a system is defined as the ratio of output noise power (P_no) to input noise power (P_ni):
F = P_no/ P_ni, at standard room temperature 290K
Noise Factor when expressed in decibels, it is called noise figure.
i.e. NF= 10 log₁₀(F)