Definition of step function

Unit step function

Options:

a) exists only for positive side
b) is zero for negative side
c) discontinuous at time t=0
d) all of the above

Correct Answer: d) all of the above

Explanation:

Unit step function is a type of function that exists only for positive side and is zero for negative side. The unit step function is discontinuous at time t=0.
The unit step function u(t) is defined as
u(t) = 0 for t<0
= 1 for t>0