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Waves Pre-Assessment

Waves Pre-Assessment . Characteristics of Waves. 1 and 2. Draw & label a sine curve. Crests. amplitude. Di spl a c e ment. Wavelength. Trough. 3. The highest points on a transverse wave are called crests. 4. . The lowest points on a transverse wave are called the troughs. 5.

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Waves Pre-Assessment

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  1. Waves Pre-Assessment Characteristics of Waves

  2. 1 and 2. Draw & label a sine curve. Crests amplitude Di spl a c e ment Wavelength Trough

  3. 3. • The highest points on a transverse wave are called crests.

  4. 4. • The lowest points on a transverse wave are called the troughs.

  5. 5. • The greatest distance that particles are displaced from their normal resting positions because of a wave is called the amplitude.

  6. 6. Define compression • Compression is crowded coiled areas on a spring. Area of compression

  7. 7. Define rarefaction • Stretched out areas on a spring. Area of rarefaction

  8. 8. • The distance from one crest of a wave to the crest of the next wave is called the wavelength.

  9. 9. • The time required for one full wavelength of a wave to pass a certain point is called the period.

  10. 10. • The frequency of a wave is the number of full wavelengths that pass a point in a given time interval.

  11. 11. Write the frequency-period equation. • Frequency (f) = 1/period or 1/T • Frequency is measured in Hertz and period is measured in seconds.

  12. 12. The full range of light at different frequencies is called the • EM spectrum .

  13. 13. Frequency is measured in the unit of • HERTZ (Hz) • Or Cycles/second

  14. 14. Wavelength is measured in the unit of • LENGTH (meter) • It could also be in nm, cm, or mm.

  15. 15. Speed = • Wavelength (l) / period (T) • The Greek letter lamda (l) is the symbol for wavelength

  16. 16. Speed = • Frequency (f) / wavelength (l) • Or f / l

  17. 17. The symbol for frequency is • f • What unit is used to measure frequency? • Hertz (Hz)

  18. 18. The symbol for wavelength is • l • Typically wavelength is measured in nanometers (nm)

  19. 19. Write the wave-speed equation. • V = f x l • V = velocity or speed • f = ? • Frequency • l= ? • wavelength

  20. 20. Sound travels better and faster in • water

  21. 21. • Sound waves travel faster in solids than in air or water. (air and water can be in either order)

  22. 22. • The speed of a wave depends on themedium. • A medium is the substance that the wave is traveling in or through.

  23. 23. • In a given medium the speed of the wave remains the same, but the frequency increases and the wavelength decreases.

  24. 24. • Electromagnetic waves (such as visible light) do NOT need a medium.

  25. 25. • The symbol c stands for the speed of light which is known to be equal to 3 x 108 m/s.

  26. 26. • Pitch is determined by frequency at which sound waves strike your ear drum. • The higher the frequency = higher the pitch

  27. 27. • Doppler effect refers to a body IN MOTION. When the object is coming towards you, the frequency is HIGHER than the frequency when the object is going AWAY . So when the object is moving toward you the sound has a HIGHER pitch (due to higher frequency. *

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