Learn Russian: Динамик отправляет импульс туда, куда распространяется звук. - The speaker sends the pulse to where the sound travels.

Both the main clause and the relative clause describe motion towards a destination. The speaker sends the pulse 'to there' (туда), and the sound travels 'to where' (куда). If this sentence described a static location (where something is, rather than where it is going), you would use там, где.

Is динамик related to the English word 'dynamic'?

They share the same Greek root, but динамик is a noun that specifically means an audio speaker or loudspeaker. If you want to use the adjective 'dynamic', you would say динамичный or динамический.

Why is the verb распространяется used for 'travels' here?

The verb распространяться literally means 'to spread', 'to expand', or 'to propagate'. It is the standard technical term used in Russian to describe how sound, waves, or light travel through an environment. It is reflexive because the sound is spreading on its own, rather than spreading a separate object.

Why does the subject звук appear after the verb at the very end of the sentence?

In Russian, word order is flexible and the most important or newest piece of information usually goes at the end of a clause. Putting звук last emphasizes what exactly is doing the traveling, which sounds much more natural in this context than the direct English word order.