Presentation on theme: "Part I - Characteristics of Waves"— Presentation transcript:
1 Part I - Characteristics of Waves Waves & SoundPart I - Characteristics of WavesLearning GoalSOL PS 8 – The student will investigate and understand characteristics of sound and technological applications of sound waves.
2 Essential Questions What are the measurable properties of waves? What is a wave?What are the measurable properties of waves?How are wavelength, frequency, speed calculated?
3 A. What is a wave?Wavesrhythmic disturbances that carry energy through matter or space (Video Clip)Mediummaterial through which a wave transfers energysolid, liquid, gas, or combinationelectromagnetic waves don’t need a medium (e.g. visible light)Video Clip
4 A. What is a wave?Two Types:Longitudinal Transverse
5 A. What is a wave? Transverse Waves medium moves perpendicular to the direction of wave motion
6 A. What is a wave? Longitudinal Waves (a.k.a. compressional) medium moves in the same direction as wave motion
7 A. What is a wave? Wave Anatomy compression wavelength rarefaction Amount of compression corresponds to amount of energy AMPLITUDE.
8 B. What are the measurable parts of a wave? Your ideas?
9 B. What are the measurable properties of wave? Simulation: Waves on a StringAnswer the following:1) How does the amount that I wiggle the wrenchaffect the wave?2) How does the speed that I wiggle affect the wave?3) Switch to “Oscillate”:What happens when I change amplitude?What happens when I change frequency?What happens when I change damping?Explain these three underlined words.
10 B. What are the measurable parts of a wave? Wave Anatomycorresponds to the amount of energy carried by the wavecrestswavelengthamplitudenodestroughs
11 B. What are the measurable parts of a wave? Frequency ( f )# of waves passing a point in 1 secondHertz (Hz)1 secondshorter wavelength higher frequency higher energy
12 C. How are wave properties calculated? Velocity ( v )speed of a wave as it moves forwarddepends on wave type and mediumv = × fv: velocity (m/s): wavelength (m)f: frequency (Hz)
13 C. How are wave properties calculated? EX: Find the velocity of a wave in a wave pool if its wavelength is 3.2 m and its frequency is 0.60 Hz.GIVEN:v = ? = 3.2 mf = 0.60 HzWORK:v = × fv = (3.2 m)(0.60 Hz)v = 1.92 m/svf
14 C. How are wave properties calculated? EX: An earthquake produces a wave that has a wavelength of 417 m and travels at 5000 m/s. What is its frequency?GIVEN: = 417 mv = 5000 m/sf = ?WORK:f = v ÷ f = (5000 m/s) ÷ (417 m)f = 12 Hzvf
15 D. How do waves behave? Reflection occurs when a wave bounces back after striking a barrier.
16 D. How do waves behave?Refraction occurs when a wave bends as it passes from one medium to another.
17 D. How do waves behave?Video Clip: Wave Interference
18 LET’S REVIEW! (copy into notes) energyA wave is created when a source of ________ causes a vibration to move through a _________.There are several types of mechanical waves including _____________ waves and ____________ waves.Draw an example of each.mediumlongitudinaltransverse
19 LET’S REVIEW! (copy into notes) A _____________(compression) wave is a wave in which the vibration of the medium is ____________ to the direction in which the wave travels.This type of wave consists of a repeating pattern of _____________ and _____________.longitudinalparallelcompressionsrarefactions
20 LET’S REVIEW! (copy into notes) All waves exhibit certain characteristics: __________, ___________, and ___________.Draw a transverse wave and label the three things listed above.Draw a longitudinal wave and label the three things listed above.wavelengthamplitudefrequency