# Sound and light

 .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } Origin of music Define Sound vibrations that travel through air or another medium and can be heard when they reach the ears. Define sound waves in the air. Pressure waves that move back and forth vibrations of particles of the medium through which the sound moves. Define compression in sound. Regions of high air pressures Define rarefaction in sounds Region of low air pressures Define wavelengths A distance that a disturbance travels along a medium in one complete wave cycles transverse wave the measurement of one wave crest to the next adjacent wave crest.  These are energy that is carried away from the source. Longitudinal waves repeating patterns of compression and rarefactions measured as the distance from one compression to the next adjacent compression or the distance from one rarefaction to the next adjacent rarefaction. ****Speed of sound**** Define pressure waves repeating patterns of high and low pressure(compression and rarefaction) What are high pressure in pressure waves? The arrival of a compression What are low pressure in pressure waves? the arrival of a rarefaction Sine curves at high pressures at a peak on the graph is high Sine curves at low pressures at a low peak on the graph what are zero points on the graph for pressure? the pressure that the air would have What are sound waves traveling through the air? They are Longitudinal waves with compression and rarefactions ****pitch and frequency**** Frequency Frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium Frequency of a wave a number of complete back and forth vibrations of a particle of the medium per unit of time What is the frequency of sound waves that a human can hear? between 20 Hz and 20000 Hz What is Infrasound any sound with a frequency below audible range of hearing (less than 20Hz) what is ultrasound any sound above audible range of hearing (20000Hz) ***Pitch*** Define pitch the sensation of a frequency of sound What is a high pitch sound a high frequency sound wave What is a low pitch sound a low frequency sound wave Define constant certain sound waves that when played on an instrument, plays simultaneously and will be pleasant. .remove_background_ad { border: 1px solid #555555; padding: .75em; margin: .75em; background-color: #e7e7e7; } .rmbg_image { max-height: 80px; } AuthorAnonymous ID211071 Card SetSound and light DescriptionSound and light Updated2013-04-03T02:15:25Z Show Answers