1 / 11

Waves

Waves. Students will learn about waves. Waves. Waves transfer energy without the transfer of mass. A wave is a vibratory disturbance that is transmitted through a material or through space. Mechanical Waves.

bendek
Télécharger la présentation

Waves

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Waves Students will learn about waves

  2. Waves • Waves transfer energy without the transfer of mass. • A wave is a vibratory disturbance that is transmitted through a material or through space.

  3. Mechanical Waves • Mechanical waves require a material medium for transmission. The energy disturbance is propagated by the molecules of water, air, or a spring. • Transverse waves exhibit simple harmonic motion about a rest position perpendicular to the direction of motion. (EX: waves on a string) • Longitudinal waves exhibit SHM parallel to the direction of motion (EX: sound, slinky) • Surface wave exhibit motion both parallel and perpendicular to the direction (EX water waves)

  4. Electromagnetic Waves • Electromagnetic waves do NOT need a material medium for transmission. They can travel in a vacuum. (EX: light)

  5. Period • The time it takes for a wave to repeat itself • Measured in seconds

  6. Frequency • Number of waves per second • Frequency is the inverse of period • Measured in Hertz (older measurements in 1/second or second^(-1))

  7. Amplitude • Amplitude is the maximum displacement of any particle in the medium relative to its rest position. • In a transverse wave the maximum upward displacement is the “crest” and the minimum downward displacement is the “trough” • In longitudinal waves the particles produce region of maximum compression called condensations and minimum compression called rarefactions. • Amplitude is related to the energy carried by the wave. • Amplitude in sound is Loudness; in light it is brightness.

  8. Wavelength • The distance between two successive points on a periodic wave is the wavelength. • Wavelength is measured in meters. • Wavelength is symbolized by the Greek letter lambda.

  9. Speed of a wave • Speed = wavelength x frequency (m/s) • Wavelength = speed/frequency

  10. Example • What is the wavelength of a sound wave whose speed is 330 m/s and whose frequency if 990 Hertz? • Speed = wavelength x frequency • Wavelength = speed/frequency • = 330 m/s/990 = 0.33 m

  11. Speed of light • All electromagnetic waves travel in space at the speed of light, c, equal to 3 x 10^8 m/s • (Einstein showed that nothing can exceed the speed of light, c = 3 x 10^8 m/s)

More Related