All waves carry energy

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## All waves carry energy

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**All waves**carry energy Waves**Wave Components** • Wavelength () • This is the distance from the crest of one wave to the crest of the next wave (or trough to trough)**Wave Components**Amplitude This is the height of a wave from the mid-point to a crest (or from the mid-point to a trough)**Wave Components**Frequency (f) • This is the number of complete waves per second. It is measured in Hertz (Hz)**Examples of Frequency**What is the frequency of the second hand of a clock? Frequency = 1cycle/60 sec What is the frequency of US Presidential elections? Frequency = 1 election/4 yrs**Frequency & Pitch**high frequency = high pitch low frequency = low pitch**Transverse vs. Longitudinal Waves**• Transverse waves (water waves, light waves) move perpendicular (at a 90o angle) to the direction of the wave and the direction its energy is traveling**Transverse vs. Longitudinal Waves**• Sound is a longitudinal wave, meaning that the vibrations move the same direction the wave is traveling in**Example of what a speaker does to air molecules to produce**sound A longitudinal wave!