Question

Atomic clocks have a stability of ____

(a) 10^-5

(b) 10^-8

(c) 10^-10

(d) 10^-11

I have been asked this question by my school principal while I was bunking the class.

My question is based upon Available Technologies for Cognitive Radio topic in chapter Cognitive Radio Basics of Cognitive Radio

Answer 1

Right choice is (d) 10^-11

Explanation: Atomic clocks have a stability of  10^-11 . However they consume high power and are large in size. Local oscillators have a stability of   10^-6. Local oscillators drift over time and may result in inaccuracy of about 90 ns.