Chapter 10, Section 2 Notes WAVES Wave Properties.

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Presentation transcript:

Chapter 10, Section 2 Notes WAVES Wave Properties

Section 2 Main Idea: Wave properties depend on the vibrations of the wave source and the material in which the wave moves. Ways waves differ 1. How much energy they carry 2. How fast they travel 3. How they look

How they look…continued… a. Transverse waves have crests – the highest points, and troughs – the lowest points. b. Compressional waves have dense regions called compressions and less dense regions called rare factions. See page 296.

Wavelength – the distance between one point in the wave to the nearest point just like it. Frequency – how many wavelengths pass a fixed point each second. See page 297. 1. Expressed in hertz (Hz) 2. As frequency increases, wavelength decreases.

The frequency of a wave equals the rate of vibration of the source that creates it. Wave velocity, or v, describes how fast the wave moves forward. 1. Velocity = wavelength x frequency, or… v = λ x f

Practice Problems on page 299: 1. 2. 3. 4.

Light waves travel faster than sound waves. Sound waves travel faster in liquids and solids than in gas. Light waves travel faster in gases and empty space than in liquids and solids.

Amplitude – a measure of the energy in a wave. See page 300. 1. The more energy a wave carries, the greater its amplitude. 2. Amplitude of compressional waves is related to how tightly the medium is pushed together at the compression.

The denser the compressions, the larger the amplitude is and the more energy the wave carries. The less dense the rarefactions, the larger the amplitude and the more energy the wave carries.

Amplitude of transverse waves a. The distance from the crest or trough of a wave to the normal position of the medium. b. Example: how high an ocean wave appears above the water level.