Frequency: This refers to the number of vibrations per second and is measured in hertz (Hz). Higher frequencies result in higher-pitched sounds, while lower frequencies produce lower-pitched sounds.
Soundenergy is produced when an object vibrates, creating disturbances in the surrounding medium. These disturbances travel as waves, carrying the energy of the sound. When the waves reach our ears, they cause our eardrums to vibrate, which our brain interprets as sound.
History and Nature of Science: A student should understand the history and nature of science. A student who meets the content standard should:
Develop an understanding that historical perspectives of scientific explanations demonstrate that scientific knowledge changes over time, building on prior knowledge.
Develop an understanding that scientific knowledge is ongoing and subject to change as new evidence becomes available through experimental and/or observational confirmation(s).