Whoever places a false bomb, chemical, biological, or radioactive substance or causes to be placed, any device or object that by its design, construction, content or characteristics appears to be or to contain, a bomb, chemical, biological or radioactive substance, but it is, in fact an inoperative facsimile or imitation of such a device or substance or bomb and which the person knows, intends or reasonably believes will appear to be a bomb or such substance under circumstances in which it is likely to cause public alarm or disruption has committed the act of placing a false bomb, chemical, biological or radioactive substance.