# Unit 1 - Waves (Part 1).pdf - What are waves • A wave is...

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Unit 1 - Waves PART 1 What are waves? A wave is a travelling disturbance that transports energy but not matter. Mechanical waves ° waves propagate through a liquid, solid or gas. Ex/ sound, earthquakes, ocean waves, etc. Electromagnetic waves ° these waves do not require a medium and can travel through a vacuum or empty space Ex/ radio waves, light, x-rays, radiation, etc. Periodic motion is a repetitive vibration where the same movement occurs over and over before the vibration dies out. Periodic motion causes continuous waves . A tuning fork ° continuous An explosion noise ° not continuous Vibration, oscillation, and cycle are all words for one complete wavelength Continuous waves can be transverse waves OR longitudinal waves Transverse Waves A transverse wave is a wave where motion occurs perpendicular to the direction the wave is travelling. Common Examples: ropes, ocean waves, etc.

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Longitudinal Waves A longitudinal wave is a wave where the motion of wave is parallel to the direction the wave is travelling. All sound waves are longitudinal waves Biophysical note on sound waves… Characteristics of Waves Both longitudinal and transverse waves have all of the following characteristics: period (T) frequency (f) wavelength ( °) amplitude (A) speed of propagation (v)
Frequency (f) ± = ²³´µ¶· ¸± ¹ºµ·»¼º¸²½ ½¶¾¸²¿ Measured in Hz (cycles/sec) # of cycles per second Oscillations, vibration, cycle all mean the same thing High frequency ° Low frequency ° Period (T) À = ½¶¾¸²¿½ ²³´µ¶· ¸± ¹ºµ·»¼º¸²½ Essentially it is the time in seconds for 1 complete cycle to happen Frequency and period are the inverse of each other Example 1 A diving board takes 0.080 sec to make one complete vibration.

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