Sound
How vibrations make sounds that travel to our ears.
01How Sounds Are MadeLinking every sound you hear to a vibrating object.Read lesson →02Sound Needs a MediumLearning that sound travels through solids, liquids and gases — but not through space.Read lesson →03Pitch and LoudnessRelating pitch to frequency and loudness to amplitude.Read lesson →04Echoes and HearingUsing echoes to find distances and seeing how the ear detects sound.Read lesson →