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Waves Presentation

Transcript: Visible Light 700 nm - 400 nm Only electromagnetic waves we can see, we see these waves as the colors of the rainbow Each color has a different wavelength Ex: Colors, Light Bulbs Frequency Radio 30 kHz - 3 GHz Longest wavelengths in the electromagnetic spectrum Carry signals Ex: Telescope, radio stations Infrared lies between the visible and microwave portions of the electromagnetic spectrum Has a range of wavelengths Far infrared waves are thermal Ex: Remote, Infrared lamps Frequency- Number of waves made per cycle. Measured in Hertz. Relationship: Increasing frequency increases wavelength. Absorption Photons from light hit atoms and molecules causing them to vibrate Darker objects absorb more light Diffraction Bending & spreading of waves around an obstacle Most pronounced when light wave strikes an object with a size comparable with its own wavelength Refraction When light waves change direction as they pass from one medium to another Different wavelengths of light are slowed at different rates Change in speed bends light Gamma 200 kev - mev Most energy of any other wave in the electromagnetic spectrum Generated by radioactive atoms and in nuclear explosions Can kill living cells Ex: Sterilizing medical equipment, CT scans Micro 300 MHz - 300 GHz Good for transmitting information from one place to another Ex: satellite, microwave at home Waves Presentation Electromagnetic Waves Waves A wave is a disturbance that transfers energy through a medium from one point to another. Two types of waves are Transverse and Longitudinal. The energy of a wave is carried through solids, liquids, or gases. A medium is the substance that transports the wave from its source to another location. Longitudinal Waves' displacement is parallel to the direction of the wave and Transverse waves are perpendicular to the direction of the wave. Crest- Highest point of a wave. Trough- Lowest point of a wave. Positive Amplitude- Amplitude above the medium. Negative Amplitude- Amplitude below the medium. Wavelength- Distance between one crest or trough of a wave to the next. Waves that do not require a medium to propagate. Can travel not only through air and solid materials, but also through the vacuum of space. Electromagnetic Spectrum - the range of wavelengths or frequencies over which electromagnetic radiation extends. X-rays 100 ev - 200 ev Higher energy than ultraviolet waves Small wavelengths X-ray light tends to act more like a particle than a wave Ex: x-rays, Ultraviolet 400 nm - 10 nm These waves are invisible to the human eye 3 Regions: the near ultraviolet, the far ultraviolet, and the extreme ultraviolet Ex: Sun rays, Tanning bed Behavior of Waves Terms Reflection When light hits an object and bounces off Smoother surfaces reflect more Color is waves of light reflected Behavior of Waves Scatter When light bounces off an object in a variety of directions Amount of scattering depends on the wavelength, size, and structure of object Electromagnetic Waves Electromagnetic Waves

Waves Presentation

Transcript: Constructive- If two waves meet in a way where the crests line up with one another it becomes a constructive interference. Diffraction Reflection Transverse Waves Longitudinal Waves Refraction is the change in direction and wavelength when a wave moves from one medium to another. Amplitude is the measure of displacement of the wave from it's rest position. Wavelength is the distance between two points of a wave. For example, the distance from between two crests. A longitudinal wave is a wave where the disturbance travels in the same direction as the wave. waves Crest Example: An example is an S Wave which is a wave that causes earthquakes. Example: An example of a surface wave is an ocean wave. Example: An example of a longitudinal wave is a sound wave. refraction A trough, opposite of a crest, is the lowest part of a wave. Wavelength Trough Diffraction is when a wave remains in the same medium, but bends around an obstacle. Amplitude and Frequency Frequency is the number of times per second that a wave cycles. If there is a high frequency waves will be closer together. But if there is a low frequency they will be farther apart. So someone with a low frequency would have a deep voice but if someone had a high frequency their voice would sound high. Surface waves A transverse wave is a wave where the disturbance moves perpendicular to the direction of the wave. by caitlyn khut Reflection occurs when a wave bounces off a boundary, changing direction but remaining in the same medium. Amplitude Destructive- If two waves meet and the trough and crest go over each other and create 0 it becomes a destructive interference. A surface wave is a wave that travels along the surface of a medium. A surface wave moves in a circular motion. A crest is the highest point of a wave. interference wave characteristics Wave interaction A wave is a disturbance that transfers energy through matter or space. Mechanical WAVES frequency MECHANICAL Wave

Waves Presentation

Transcript: DVDs & Waves CONCLUSION A sonogram is a noninvasive medical procedure that helps diagnose and treat health conditions. The method uses high frequency sound waves to produce a specific image of the patient's body. They don't use radiation, so it's much safer than an x-ray since patients don't have to worry about the possible side effects of radiation exposure. (Two Views LLC) General Info! Compact Disk The CD was invented by James Russel in 1965 An audio CD or a CD-ROM has information coded in tiny pits on its surface. A laser light is focused to get information on the sequence of those pits. The Blue Ray disc was invented by the Blu-Ray disc association Its name was derived from the underlying technology, which uses a blue-violet laser to read and write data. Its correct abbreviation is BD, not BR or BRD! The spelling is NOT a mistake! In "Blu-ray" the letter 'e' was purposefully dropped so that the term could be registered as a trademark. There isn't any possible way to actually prevent a tsunami from happening. However, there are many ways to prepare for one in areas where tsunamis are active. With an effective warning system, people can be evacuated, and damage can also be prevented. Tsunami walls, flood gates, & channels are three common ways that tsunamis are potentially prevented. CD, DVD, & Blu-Ray Technology Credit Cards Driver's Licenses Used on some barcodes to prevent things from getting stolen the medical field (X-ray holography, Endoscopic holography, Etc.) Waves How to Prevent Tsunamis Caused when the ocean is suddenly displaced on a large scale by an underwater disturbance (earthquakes); the ocean floor is raised or dropped & large tsunami waves can be formed Holograms Sonograms Seismic Waves & Tsunamis Where is holography used? General Info! General Info! Digital Versatile Disc Invented in 1995 by Phillips, Sony, Toshiba & Time Warner. Storage Capacity from 4.7 GB to 17 GB Access rates differs from 600 KB/s to 1.3 MB/s Kenzie Peacock, Cheyenne Kovacsy, & Amy Figurski - 3rd period (CD) As the disc spins, the ray of radiation passes over tiny differences in elevation, which alters the the wavelengths of the reflected waves. These waves pass back through the system of lenses, which are refracted in a different direction and in turn alter an electrical current that is "read" to produce sound. Additionally, CD players use infrared light, which means the spaces on the CD must be far apart enough to allow for infrared's relatively large wavelength. DVD players go more in-depth on this concept by relying on visible red light, which has a shorter wavelength than infrared. Blu-Ray Discs use blue visible light, which have an even shorter wavelength. Principles of holograms: interference & diffraction of light waves Described as a "window with memory" Waves are used in many different ways, and are often a big part of our daily lives. Most of the time, we don't even realize they're being used! CD's, DVD's, Blu-Ray disks, holograms, seismic waves, tsunamis, and sonograms are just a few examples out of the abundance that exist! How do DVDs, Blu-Ray disks & CDs use waves?? Sonography can be used to examine the: uterus, ovaries, liver, kidneys, spleen, thyroid, pancreas, gallbladder and bladder. It is useful for seeing the inside of the heart to determine any blockages or abnormal structures, measuring blood flow, detecting kidney stones and identifying cancers early. It can also be used to guide other slightly invasive procedures with limited visibility like a needle biopsy or needle aspirations. (Sanford-Brown)

Waves Presentation

Transcript: First, there is a medium that carries the disturbance from one location to another. The frequency of a sound wave is how fast the wave passes through a medium. Frequency is measured in hertz. 1 Hertz = 1 vibration per second. Sound Waves Sound waves are apart of our everyday lives, anything you can hear are sound waves. They are created by vibrating objects and spread through a medium from one location to another. What are examples of a medium? Sound is a Mechanical Wave. Sound is a mechanical wave and can not travel travel through a vacuum. Sound waves are longitudinal, waves in which the motion of the individual particles of the medium is in a direction that is parallel to the direction of the energy transport. speed = how fast frequency= how often. Second, there is an original source of the wave, some vibrating object capable of the medium. A medium is typically air but can be anything from water to steel. The sensation of a frequency is known as the pitch. In simpler words, pitch is how good the sound is. When objects vibrate, they tend to vibrate at a particular frequency or a set of frequencies which is called natural frequency. To change the natural frequency, there must be an alternation of speed or wavelength. A medium is whatever the wave passes through. Third, the sound wave is transported from one location to another by means of particle-to-particle interaction. Waves Presentation Pitch of a sound wave. What is a medium? What does it take for a sound wave to happen? Frequency of a Wave.

Waves presentation

Transcript: Mostly all about Waves by Rohit V. A wave is a disturbance that carries energy from one place to another. Matter is not carried with waves. What is A wave? Every thing is here There are 5 parts to a wave. The crest, trough, amplitude, and wavelength and the resting position. Parts of the waves Parts of the wave resting position The crest is the highest point of the wave. The crest The Crest The trough is the lowest point of the wave. The trough The Trough How far the medium moves from rest position (where it is when not moving). The Amplitude The amplitude The distance between one point on a wave and the exact same place on the next wave. The wavelength the Wavelength The resting position is the position the medium would take if there were no wave. the rest position the Rest The 3 types of waves are Longitudinal waves,Transverse waves, and Surface waves. The types of waves Types of waves Movement of the particles are parallel to the motion of the energy. Sound waves moving through the air is an example of this type of wave. Longitudinal waves Longitudinal Movement of the particles are at right angles (perpendicular) to the motion of the energy. Movement of a wave through a solid object like a stretched rope or a trampoline is an example of this type of wave. Transverse Particles travel in a circular motion. These waves occur at interfaces. Examples include waves in the ocean and ripples in a cup of water. One consequence of occurring at an interface is that the motion of the particles diminish with distance from the interface. The further from the interface the smaller the rotation of the particles until as some distance from the surface, there is no more movement or energy propagation. Surface waves Transverse reflection: When waves bounce off a surface. If the surface is flat, the angle at which the wave hits the surface will be the same as the angle that the wave leaves the surface. In other words, the angle in equals the angle out. This is called the law of reflection. 2. refraction: Waves can bend; this happens when a wave enters a medium and its speed changes; the amount of bending depends on the medium it is entering 3. diffraction: The bending of waves around an object. The amount of bending depends on the size of the obstacle and the size of the waves. large obstacle, small wavelength = low diffraction small obstacle, large wavelength = large diffraction Types of waves changes Types of wave changes

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