![]() Powered by django-wiki, an open source application under the GPLv3 license. This is why the light from the Sun can reach us through the vacuum of space. They do not need a medium and can travel through completely empty space by oscillating electric and magnetic fields. The visible light that we see with our eyes is actually an example of an electromagnetic wave. For sound waves coming from a guitar, the medium is the air. For waves rippling on a pond, the medium is the water. ![]() We call this undisturbed position the equilibrium point. Scientists call the stuff a wave travels through the medium and in this case, it is the audience.Īs a wave propagates through space, the particles in the medium oscillate about their undisturbed positions. Before the wave moves through the air, each air molecule has some undisturbed position from the speaker that we can measure in meters. People get these mixed up because there's an alternate way to create a graph of this sound wave. This way the wave transports energy around the stadium, moving from person to person. The wavelength of a sound wave is the distance between two compressed regions of air. So what is actually happening? As each individual stands and sits they exert a burst of energy, and trigger the next person to do the same. The individuals don’t move from their seats, yet we can see the wave moving all the way around the stadium. Each person stands then sits down again, one after the other, creating a ripple effect that moves around the audience. Think of a wave traveling around the audience in a football stadium. When they move they carry energy with them, and we refer to this movement as propagation. There is a transfer of material from place to place. Imagine a car driving along a road or a football passing between players. We simply say that the yellow line is the wave. ![]() The Doppler Effect is a phenomenon that allows one to measure an object's: radial motion The light from an object moving tangentially (to your left or right) will exhibit: no shift If a light source is approaching you at a speed very close to the speed of light, it will appear: bluer than it is.Particle movement can be understood as matter moving from A to B. The yellow line represents the position of the medium as a wave travels through it. According to Wein's Law, if the surface temperature is increased by a factor of 2, its peak wavelength will: decrease by a factor of 2 The total energy radiated by a blackbody depends on: the fourth power of its temperature The wavelength at which a blackbody radiates most depends on its: temperature Increasing the temperature of a blackbody by a factor of 3 will increase its energy by a factor of: 81 Stefan's Law says: that if the Sun's temperature were doubled, it would give off 16X more energy. ![]() temperature What does the phenomenon of diffraction demonstrate? wave nature of light What does the phenomenon of interference demonstrate? wave nature of light The temperature scale that places zero at the point where all atomic and molecular motion ceases is: Kelvin What is true of a blackbody? Its energy peaks at the wavelength determined by its temperature. visible Knowing the peak emission wavelength of a blackbody allows you to determine its _. Which type of electromagnetic radiation has the shortest wavelength? gamma rays The Sun's blackbody curve peaks in the _ portion of the spectrum. Which type of electromagnetic radiation travels fastest in a vacuum? they all travel at the same speed Which form of electromagnetic radiation is absorbed by carbon dioxide and water vapor in our atmosphere? infrared Which form of electromagnetic radiation would be blocked in the stratosphere by ozone? ultraviolet Of all the forms of electromagnetic radiation, the one with the lowest frequency is: radio waves The Earth's ionosphere partially blocks which form of electromagnetic radiation? radio The two forms of electromagnetic radiation that penetrate the atmosphere best are: visible and radio waves Electromagnetic radiation with a wavelength of 700 nm would be: red light The visible color of electromagnetic radiation that has the shortest wavelength is: violet Colors appear different to us because of their photons' different: frequencies The radiation our eyes are most sensitive to lies in the color: yellow-green at about 550 nm. Electromagnetic radiation: can behave both as a wave and as a particle. Which of these is constant for ALL types of electromagnetic radiation in a vacuum? velocity Which statement gives the relationship between the waves in the electric and magnetic fields in an electromagnetic wave? They are in phase but perpendicular to each other in space.
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