This definitions covers Key Definitions within Sound Waves for GCSE Physics. Revise Sound Waves in Waves for GCSE Physics with 13 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 7 of 13 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
Topic position
Section 7 of 13
Practice
13 questions
Recall
15 flashcards
📖 Key Definitions
Longitudinal wave: A wave in which particles vibrate parallel to the direction of wave travel, producing compressions and rarefactions.
Compression: A region in a longitudinal wave where particles are pushed together, creating higher pressure.
Rarefaction: A region in a longitudinal wave where particles are spread apart, creating lower pressure.
Ultrasound: Sound waves with a frequency above 20,000 Hz (above the upper limit of human hearing).
Amplitude (sound): The maximum displacement of air molecules from their rest position; greater amplitude = louder sound.
Frequency (sound): The number of compressions passing a point per second; higher frequency = higher pitch.