Although both wave types are sinusoidal, transverse waves oscillate perpendicular to the direction of propagation, while longitudinal waves oscillate parallel to the direction of propagation. The most common transverse and longitudinal waves are light waves and sound waves, respectively. All electromagnetic waves light waves, microwaves, X-rays, radio waves are transverse.
All sound waves are longitudinal. Sound is a longitudinal wave, while light is a transverse wave. Polarization requires the direction of the wave to be perpendicular to the direction of propogation; only light can do this.
Doppler effect, refraction, and interference occur in both wave types. If you've found an issue with this question, please let us know. With the help of the community we can continue to improve our educational resources. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.
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Hanley Rd, Suite St. Louis, MO Subject optional. Email address: Your name:. Possible Answers: Longitudinal. Correct answer: Longitudinal.
Explanation : Sound waves are longitudinal waves, meaning that the waves propagate by compression and rarefaction of their medium. Report an Error. Possible Answers: Visible light. A wave produced by a rope oscillating in a plane. Correct answer: A sound wave. Explanation : Longitudinal waves transmit energy by compressing and rarefacting the medium in the same direction as they are traveling. Possible Answers: Light with a wavelength of exactly.
Correct answer: A vibrating violin string. Explanation : A simple definition of a standing wave is a wave that is self-reinforcing, which is to say that reflection of the wave through the medium results in some areas of amplification anti-nodes of the wave and some areas of nullification nodes. Light as a wave: Light can be described modeled as an electromagnetic wave.
In this model, a changing electric field creates a changing magnetic field. This changing magnetic field then creates a changing electric field and BOOM - you have light. They describe the relationship between the electric and magnetic field well mostly the last two. If you like, you can use vector calculus on the above equations and then eliminate B to get:. This is the form of the wave equation.
With the photon model, a brighter light just produces more photons per second. This is a difficult question - the answer is that in some situations light behaves as a particle and in others it behaves as a wave. We always have multiple models for things that we see. However, they are different than this wave-particle model of light. When you start looking at momentum, it is almost always except in the awesome textbook Matter and Interactions defined as:.
This is great. It goes great with the momentum principle that says that the net force on an object is the time rate of change of momentum. Of course, you could also say it is wrong. What if you have a proton moving at 90 percent the speed of light? Instead, you have to use this model:. However, I like to call this just plain momentum. But what does this have to do with two models for light? Which model would I use? The answer depends on how quickly you want to calculate this and how accurate you want your answer to be.
Here is a plot of momentum of a proton as a function of speed for the two models. You can see that at lower speeds, the two models agree.
The faster the proton goes, the less the two models agree. Everyone knows the model for the gravitational force, right? You can write it like this:. That is wrong. That model only works when close to the surface of the Earth. The gravitational force is:.
That is still wrong, but better. Because the mg model works well enough. The sun emits lots of radiation in wavelengths that span from X-rays to infrared. Sunlight provides almost all of the energy required for life on Earth.
Small, cool objects release much less radiation. But every object emits some. That includes people. We give off small amounts of infrared light generally referred to as heat.
Whitmore points to her cell phone as a common source of many types of light. Smartphones use visible wavelengths to light up the screen display.
Your phone talks to other phones via radio waves. And the camera has the ability to detect infrared light that human eyes cannot see.
Use a remote control for a television or other device. By Jennifer Look July 16, at am. Light is an electromagnetic wave. White light contains waves of many different visible colors.
Each color of light has a characteristic wavelength and energy. Look; L. Steenblik Hwang Most of the light spectrum, however, falls outside that range.
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