diffrent between sound and light wave
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COMPARISON OF LIGHT WAVES WITH SOUND WAVESThere are two main differences between sound waves and light waves. The first difference is invelocity. Sound waves travel through air at the speed of approximately 1,100 feet per second; light wavestravel through air and empty space at a speed of approximately 186,000 miles per second. The seconddifference is that sound is composed of longitudinal waves (alternate compressions and expansions ofmatter) and light is composed of transverse waves in an electromagnetic field.Although both are forms of wave motion, sound requires a solid, liquid, or gaseous medium; whereaslight travels through empty space. The denser the medium, the greater the speed of sound. The opposite istrue of light. Light travels approximately one-third slower in water than in air. Sound travels through allsubstances, but light cannot pass through opaque materials.Frequency affects both sound and light. A certain range of sound frequencies produces sensationsthat you can hear. A slow vibration (low frequency) in sound gives the sensation of a low note. A morerapid sound vibration (higher frequency) produces a higher note. Likewise, a certain range of lightfrequencies produces sensations that you can see. Violet light is produced at the high-frequency end of thelight spectrum, while red light is produced at the low-frequency end of the light spectrum. A change infrequency of sound waves causes an audible sensation—a difference in pitch. A change in the frequencyof a light wave causes a visual sensation—a difference in color.
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