16 H phy student notes Waves and Sound (1).docx

16 H phy student notes Waves and Sound (1).docx - Chapter...

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Chapter 16 Waves and Sound 16.1 The Nature of Waves A. Waves have two common features 1. A wave is a traveling disturbance. 2. A wave carries energy from place to place not matter. B. Types of waves 1. Transverse - the disturbance travels perpendicular to the direction the wave is traveling. For example light and other electromagnetic waves. 2. Longitudinal.- the motion of the medium (example air or water)is in the same direction that the wave is traveling. For example sound waves.
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3. Water waves are a combination of both waves.
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16.2 Periodic waves wave frequency A. Periodic waves- The same wave is repeated. The frequency, period, amplitude and wavelength do not change. 1. Frequency (f) - how many waves pass (or cycles) in 1 second. f (frequency) = number of waves / 1 second f = #waves/ seconds frequency is measured in Hertz, the number of waves in 1 second a.(1) A person standing in the ocean notices that after a wave crest passes by twenty more pass in 200. seconds. What is the frequency of the wave? # of waves = 20. Time for all waves to pass = 200. seconds f = #waves/ seconds f = 20 waves / 200. seconds f = .1 Hertz
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b. A person standing in the ocean notices that after a wave crest passes by 16 more pass in 270 seconds. What is the frequency of the wave? 2. Period (T) - how long it takes for one wave to pass. Period is usually expressed in seconds T (period) = 1/ frequency f = 1/T a. It takes 4 seconds for 1 wave to pass. What is the period and frequency? T ( period)= 4 seconds( how long it takes for 1 wave to pass) f (frequency) = 1/T (period) f= 1 / 4 sec f= .25 Hz b. It takes 8 seconds for 1 wave to pass. What is the period and frequency? c. A person notices the frequency of a wave is 16 Hz. What is the period? f = 16 Hz T (period) = 1/ frequency T = 1/ 16 Hz T = .0625 sec d . A person notices the frequency of a wave is 24 Hz. What is the perio d? e. 16 waves pass in 4 seconds what is the period and frequency?
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# number of waves Time for all waves to pass = 4 f (frequency)= #waves/ seconds f = 16 waves / 4 seconds f = 4 Hertz T (period) = 1/ frequency T = 1/ 4 Hz T= .25 seconds f. 5 waves pass in 25 seconds what is the period and frequency ? 3. Amplitude - distance from midpoint ( or undisturbed medium) of wave to tip of crest or down to trough. Measurement of height or loudness of wave. productivity 4. Wavelength ( λ ) - distance one wave measures. Often measured from crest to crest
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but can be measured from a point of the wave to the same point on the next wave. How many waves are there? a. If the above waves pass you in 1 second what is the frequency and period? f = 3 waves per second = 3 Hz T = 1/f T = 1/3 Hz T = 1/3 seconds b. If the above waves pass you in 3 second what is the frequency and period? 5. Wavespeed ( ν ) - how fast the wave moves. Assume all electromagnetic waves move at 3.00 x 10 8 m/s unless otherwise noted. wave speed = frequency ( wavelength) ν = f λ or ν = d/t a. A wave has a length of 3 meters and a frequency of 2 kHz. What is the wave speed? λ = 3 meters f = 2kHz ν = f λ ν = 2000 Hz (3 meters) ν = 2000 waves (3 meters) second (wave) ν = 6000 m/s b. A wave has a length of 8.00 meters and a frequency of 67.0 mHz. What is
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the wave speed? λ = 8.00 meters f = 67.0 mHz ν = f λ ν = .0670 Hz (8.00 meters)
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  • Winter '19
  • Rene Bishop
  • Frequency, Wavelength, ν, λ

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