Waves.

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Presentation transcript:

Waves

Objectives Given a diagram, be able to identify the parts of a transverse and a compression wave Given an illustration, be able to identify the amplitude, frequency, and wavelength CLE 3202.2.1 Investigate the properties and behaviors of mechanical and electromagnetic waves.

Wave Properties Ways waves differ How much energy they carry How fast they travel

Wave Properties How they look Transverse waves have crests – the highest points, and troughs – the lowest points Compressional waves have dense regions called compressions and less dense regions called rarefactions

Crest vs Trough

Wave Properties Wavelength – the distance between two identical points

Frequency Frequency – how many wavelengths pass a fixed point each second

Frequency Expressed in hertz (Hz) As frequency increases, wavelength decreases The frequency of a wave equals the rate of vibration of the source that creates it

Frequency Speed of wave depends on properties of the medium it is traveling through Wave velocity describes how fast the wave moves forward. Velocity = wavelength X frequency

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

Amplitude Amplitude – a measure of the energy in a wave The more energy a wave carries, the greater its amplitude

Amplitude Amplitude of compressional waves is related to how tightly the medium is pushed together at the compression

Amplitude 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

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

Amplitude

In a thunderstorm, why do you see lightning before you hear the thunder? Light waves travel much faster than sound waves.

Thunder & Lightning

If a wave has a high point and a low point, is it a compressional or transverse wave?

Section Check 2 Answer Transverse waves have alternating high points, called crests, and low points, called troughs. FL: SC.A.2.4.6

What is the wavelength of a wave?

Section Check 2 Answer A wavelength is the distance between one point on a wave and the nearest point just like it. FL: SC.A.2.4.6

Which of the following refers to the number of wavelengths that pass a fixed point each second? A. frequency B. period C. wavelength D. wave speed

The answer is A. Period is a length of time, and wavelength is a distance.