ማሣሰቢያ: - መ/ቤቱ የተሻስ መንገድ ካገኘ ጨረታውን በሙሱምሆነ በከፊል የመሰረዝ መብቱ የተጠበቀ ነው::
Explanation: The resistance to the motion of the vibrating body is provided partly by the medium in which the vibration takes place and partly by the internal friction.