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### 17 Cards in this Set

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 What are waves? rhythmic disturbances that carry energy through matter or space. What are some examples of waves? Water waves, microwaves, sound waves, and radio waves What is a medium? a medium is a material through which a wave transfers energy. What are the two waves that can travel without medium? Radio waves and light waves. What is a transverse wave? The medium moves at right angles to the direction te wave travels. What is the highest point of a wave called? A crest. What is the lowest point of a wave called? A trough. What is a wave length? It is the distance between one point on one wave, and the identical point on the next wave. What does Amplitude mean? Amplitude is the distance from the crest (or trough) of a wave to the rest position of the medium. The greater the amplitude, the greater the energy. What is frequency expressed in? Hertz. What does Hertz stand for? one wave per second How is wave velocity calculated? velocity= wave length * frequency what is a compressional wave? when matter vibrates in the same direction of the wave. What is Rarefaction Where the wave is not compressed. What is the speed of sound? 344 m/s at 20 C or 332 m/s at 0 C 20 000 Hz Ultra sonic waves Loudness The human perseption of sound intensity.