نوسان آزاد
type: Concept
alternative label: ارتعاش آزاد
preferred label: free oscillation @en
related: نوسان
related: زمین

نوسان
type: Concept
preferred label: oscillation @en
related: نوسان آزاد

زمین
type: Concept
preferred label: Earth @en
related: نوسان آزاد