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Waves

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.

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Waves

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  1. Waves

  2. 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.

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

  4. 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

  5. Crest vs Trough

  6. Wave Properties • Wavelength – the distance between two identical points

  7. Frequency • Frequency – how many wavelengths pass a fixed point each second

  8. 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

  9. 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

  10. 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

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

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

  13. 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

  14. Amplitude

  15. 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

  16. Amplitude

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

  18. Thunder & Lightning

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

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

  21. What is the wavelength of a wave?

  22. 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

  23. 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

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

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