WAVE INTERACTIONS Waves transfer energy without transferring matter
- Slides: 38
WAVE INTERACTIONS
Waves transfer energy without transferring matter.
Mediums Most waves require a medium to travel through. These are called Mechanical Waves. A medium is any matter that a wave travels through.
Electromagnetic Waves Any wave that does not need a medium to travel through is called an electromagnetic wave. Although we now have gravity waves……. . that are not technically electromagnetic.
Longitudinal Wave wave particles vibrate back and forth along the path that the wave travels. Compressional Wave
Compressions The close together part of the wave Rarefactions The spread-out parts of a wave
Transverse waves wave particles vibrate in an up-and-down motion.
Transverse waves Crests Highest part of a wave Troughs The low points of the wave
Amplitudeis the maximum distance the particles in a wave vibrate from their rest positions.
Wave Length For a transverse wave the wave length is from one crest or trough to another. For a longitudinal wave a wave length is from one compression or rarefaction to another.
Period and Frequency Period the time required for one full wave length to pass. It is represent with T. And is usually measured in seconds
Frequency - the number of waves produced in a given time (usually 1 second). Represented by a lower case f Units are measured in Hz
Wave Velocity - is the speed with which a wave crest passes by a particular point in space It is measured in meters/second. Wave Velocity = Frequency Wavelength
Medium Speed of Sound air (20 C) velocity m/sec 343 air (0 C) 331 water (25 C) sea water diamond iron 1493 1533 12000 5130 copper 3560 glass 5640
The Type of Wave Matters The type of wave also determines the speed. Electromagnetic waves do not need a medium. All electromagnetic waves travel through a vacuum at c = 2. 99792458 x 108 m/s. Put them in a medium and they get bounced around.
Doppler Effect How a wave sounds (pitch) depends upon the frequency. Meaning the more waves pass by in a second the higher the pitch. This can be created by the Doppler effect.
II. Properties of Sound
Pitch - description of how high or low the sound seems to a person . Loudnesshow loud or soft a sound is perceived to be.
Loudness of Sound in Decibels Sound Loudness (dbs) Hearing Damage Average Home 40 -50 Loud Music 90 -100 After long exposure Rock Concert 115 -120 Progressive Jet Engine 120 -170 Pain
Ultrasound waves with frequencies above the normal human range of hearing. Sounds in the range from 20 -100 k. Hz - Infrasound - sounds with frequencies below the normal human range of hearing. Sounds in the 20 -200 Hz range
Interference the result of two or more sound waves overlapping
Different sounds that you hear include (A) noise, (B) pure tones, and (C) musical notes.
Standing sine wave patterns of air vibrating in a closed tube. Note the node at the closed end and the antinode at the open end. Only odd multiples of the fundamental are therefore possible.
Standing waves in these open tubes have an antinode at the open end, where air is free to vibrate.
Standing sine wave patterns of air vibrating in an open tube. Note that both ends have anitnodes. Any whole number of multiples of the fundamental are therefore possible.
Doppler Effect is the apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound.
Sounds from Moving Sources. A moving source of sound or a moving observer experiences an apparent shift of frequency called the Doppler Effect. If the source is moving as fast or faster than the speed of sound, the sound waves pile up into a shock wave called a sonic boom. A sonic boom sounds very much like the pressure wave from an explosion
Supersonic Flight
Resonance the frequency of sound waves exactly matches the natural frequency of an object.
Water Waves
Tsunami Wave length, 500 to 600 km in ocean
Tsunami Warning • On December 26, they were playing in the sea when Tilly • • suddenly found the water was bubbling, like on top of a beer. She immediately realized tsunami was coming because the scene reminded her of a geography lesson about Hawaii's 1946 tsunami. Right away, Tilly told her parents, sister and other tourists to escape quickly, but at first they were in half belief. However, seeing Tilly's serious and firm expression, people started to be convinced of the seriousness of the thing and instantly left the beach. At last over 100 tourists were ended up in safety with no death
http: //www. phy. ntnu. edu. tw/java/propagation. html
- How do waves transfer energy without transferring matter
- A wave transfers
- Waves and energy transfer
- A disturbance that transfers energy
- Examples of mechanical waves
- Difference between matter waves and electromagnetic waves
- Wave transfer matter
- Energy energy transfer and general energy analysis
- Energy energy transfer and general energy analysis
- Wave medium
- Kesler science
- Rate of energy transfer by sinusoidal waves on strings
- Do light waves transfer energy
- Reflection wave interactions
- Type of mechanical waves
- Wave interactions
- Flow energy review
- Differences between mechanical and electromagnetic waves
- Transfer of energy when a wave disappears into a surface
- What is energy transfer
- Example of mechanical wave
- Sound waves are electromagnetic waves true or false
- The wave chapter 13
- Sound is a longitudinal wave
- Short wave vs long wave radiation
- Electromagnetic waves vs mechanical waves
- Mechanical waves and electromagnetic waves similarities
- Surface waves and body waves
- Is a seismic wave mechanical or electromagnetic
- Compare and contrast p waves and s waves using venn diagram
- Mechanical waves and electromagnetic waves
- What are constructive waves
- Em waves can travel without
- Ability of two or more waves to combine and form a new wave
- Definition of matter waves
- Progressive waves travelling disturbances that transfer
- Is a disturbance that transfers energy
- Without title for my father who lived without ceremony
- Without a title poem