Question

What is the period of the following signal, x(t) = sin(18*pi*t + 78 deg)?

(a) ^1⁄9

(b) ^2⁄9

(c) ^1⁄3

(d) ^4⁄9

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

This is a very interesting question from Signal Classification and Properties in chapter Signals and Systems Basics of Signals and Systems

Answer 1

Right answer is (b) ^2⁄9

Explanation: The signal can be expressed as sin(wt + d), where the time period = 2*pi/w.