(a)   No person shall knowingly cause another to believe that the offender will cause serious physical harm to the person or property of such other person, such other person's unborn or a member of the other person's immediate family.
   (b)   Whoever violates this section is guilty of aggravated menacing, a misdemeanor of the first degree, and shall be subject to the penalty provided in Section 698.02. (ORC 2903.21)