True or false, an infrared photon carries more energy than an x-ray photon?
82878
False,\nX rays have a higher energy per photon than infrared rays.\n\nThe energy of a photon is given by the equation,\nE = hf\nwhere h is plank's constant and f is the frequency.\nThe higher the frequency, the higher the enegry.\nX rays have a much higher frequency than infrared light.
514605
As heat increases, great amounts of energy are released in photons- Thus, the photons have greater energy at higher heats..makes sense, right?  So, higher energy photons are those with shorter wavelengths, like for example, the color red has a longer wavelength than the color blue-and blue is a higher energy photon.  You can actually measure the temperature of materials by measuring the light emitted from them, if you know the material.
185819
X-rays can cause certain phosphors to fluoresce.
1051416
By heat (because you use the term reflection) I presume you mean radiant heat, in which case the answer applies to ALL radiant energy.\n\nEvery photon has a particular energy determined by its wavelength. When it hits a surface this energy can be transfered to the atoms and molecules that make up the surface. However, atomsand molecules obey the rules of quantum mechanics, and so the vibrational, rotational and electron energies are all quantised. If the photon has the right energy it will probably excite the atom or molecule and its energy will be transferred to a vibration or to excite an electron. If it is not, it will be reflected.\n\nIts a bit like a guitar string. If you strike it at the right frequenecy it sounds a note, otherwise it does not vibrate.
437461
Both are true, this is because heat IS light.\n\nHeat is actually the common word for 'Infra Red Radiation'... but of couse heat is shorter and easier to say. IR radiation is a form of 'light' that is just beyond our visible spectrum.\n\nWhen any type of light hits matter it causes the molecules to vibrate, this can cause IR radiation to be released, thus being felt by us as 'heat'.\n\nLikewise, when molecules are heated up, such as in a fire, they vibrate and can often release light that we can see.\n\nA fire, for example, releases a large amount of light in the red area of the spectrum thus appearing red and yellow... this happens to be near the infra red part of the spectrum, so it is hot too.\n\nCOMPLEX VERSION:\nIn an atom there are electrons, when light hits an electron it gains energy. The electron then slowly looses energy in the form of electromagnetic radiation.\nElectromagnetic radiation that is releasesd is dependant on the element, bonding involved, and the electron orbital. thus a wide variety of light can be given off.\nLight can include both visible light and infrared light... infra-red light being that which causes us to feel heat (due to its ability to vibrate the molecules of our bodies).
878883
Yes, X-Rays are very energetic particles that move at light speed (they are actually radioactive photons).  They are a form of energy and when they hit matter they can impart some of their energy to that matter making it radioactive (http://en.wikipedia.org/wiki/X-rays).\n\nAccording to Wikipedia:  http://en.wikipedia.org/wiki/Physics\n"Physics is the science concerned with the discovery and understanding of the fundamental laws which govern matter, energy, space and time."\n\nX-rays are a form of energy; they affect matter by passing through it and transferring energy to it.  They move at the speed of light, which can lead to a discussion on space-time (http://en.wikipedia.org/wiki/Space_time).\n\nX-rays are very energetic particles moving quite rapidly.  They are strong enough to penetrate most matter.  X-rays move at light speed so they are actually a form of photons.  A discussion of x-rays can lead into a discussion of Einstein’s theories, what happens at near light speed, and radiation.  You can go from there to the electromagnetic spectrum (http://en.wikipedia.org/wiki/Electromagnetic_spectrum) or to how radiation is harmful and onto radiation effects (http://en.wikipedia.org/wiki/Radiation).\n\nA black hole emits radiation in the form of x-rays and cosmic rays.  When the matter sucked into a black hole gets close to the event horizon they start to bunch up and collide.  This high-speed collision generates energy.  Only something as energetic as gamma rays or x-rays can escape a point near the event horizon.  So x-rays can lead to a discussion of black holes (http://en.wikipedia.org/wiki/Black_holes).  A discussion of black holes requires a discussion of gravity (http://en.wikipedia.org/wiki/Gravity).\n\nX-rays are used in X-ray crystallography (http://en.wikipedia.org/wiki/X-ray_diffraction) the diffraction (http://en.wikipedia.org/wiki/Diffraction) of the x-rays are used to determine the compisition and make up of crystal formations.  A discussion on diffraction can lead to the classic example of light wave interferience, when a single light source is shown throught two slits.\n\nAccording to Wikipedia:  http://en.wikipedia.org/wiki/X-Ray_Microscope\n“An X-ray microscope uses electromagnetic radiation in the soft X-ray band to produce images of very small objects.\n\nUnlike visible light microscopes, X-rays do not reflect or refract easily, and they are invisible to the human eye. Therefore the basic process of an X-ray microscope is to expose film or use a charge-coupled device (CCD) detector to detect X-rays that pass through the specimen, rather than light which bounces off the specimen.”\n\nA discussion on this topic can lead to how Intergrated Circuits and computer chips work (http://en.wikipedia.org/wiki/Charge-coupled_device).  This leads to a discussion of semiconductors and the physics of electricty.\n\nWhen the astronauts were in space they saw flashes of light when they closed their eyes.  Scientists later determined that these flashes were the result of intense radiation like gamma rays, cosmic rays, and x-rays impacting the iris.  This can lead to a discussion on the space program and how it is a perfect example of Classical Newtonian Physics.   It may be a bit of a stretch though.\n\nIt all depends on which are of physics you want to talk about.
788568
Most of them are.  But if a photon collides with an atom, it is absorbed and raises the energy level of the atom.  When the energy level of that (or any) atom decreases, the energy difference is emitted as one or more photons.  Its direction will be unrelated to the direction of any incoming photon.
360845
Yes. those of frequency higher than infra red are absorbed by the PV. IR travels right through the silicon in the PV
290359
The energy of a photon is given by E = h*f where h is planck's constant and f is the frequency.  Since photons travel at the speed of light, c, the wavelength is just:\nlambda = c / f.\n\nThe spectrum of light goes from red to violet, where red has the lowest frequency (longest wavelength) and violet has the highest frequency (shortest wavelength).  This means that violet light has more energy per photon than red light.\n\nIn radiation heat transfer, a black body is an object that absorbs all incoming radiation and reflects none (stars are nearly black).  Also, a black body emits a spectrum of radiation based on its temperature.  A plot of monochromatic emissive power vs. wavelength shows the relative "concentration" of different wavelengths of radiation in the total output.  This plot has a characteristic shape given by Planck's Law of blackbody radiation, and it has a maximum at:\n\nlambda_max * T = 2898 micrometers * K = constant\n\nwhere T is the temperature in Kelvin\n\nThus lambda_max is inversely proportional to Temperature.  This means, as the temperature of the emitting body increases, the wavelength at which more of the energy is radiated at decreases (the frequency increases).\n\nI wish I could show you the loglog plot of monochromatic emissive power vs wavelength in Mills page 453.  It shows how low temperature bodies emit in the infrared and negligibly in the visible range and as the temperature increases, the maximum moves toward the visible range.  The sun, at 5800 K has a nice plateau maximum in the visible range which explains why being able to see light is so useful for us.  Another cool thing to see in the plot is that the curve is steeper on the low wavelength side than it is on the high wavelength side: this means that as you increase the temperature of an object, it will glow red and then white because anything hot enough to have its maximum in the violet range also has a large emissive power for everything colder than violet, so all colors of light will be present.\n\nSince a hotter body radiates at higher frequencies, in a sense violet light is "hotter" than red light.\n\nTake a look at the book (or another heat transfer engineering text).  I can't explain very well with only text.
910724
In electromagnetic radiation, the lower the frequency, the lower the energy (per photon).  So, radio frequencies have the lowest energy photons.
954216
no it is wrong sunlight is the mxture of seven colors in those the infrared rays have maximum wave length , even the plants absorb the infra red rays during photosynthesis.nothing is returned by the earth
840309
I know that different colors are "visible" at different wavelengths.  So, depending on an increase/decrease in energy, you would be at varying wavelengths?
685820
X-rays are just a portion of the electromagnetic radiation spectrum. Light is also part of it, as well as microwaves, radio waves, UV rays & gamma rays. Their wavelength is .1-10 nm
48380
In general no, not in a metal.\n\nFirst, infrared is close in wavelength to visible light. (Slightly lower frequency, and longer wavelength than visible red.) So if visible light can't get through a metal it isn't likely infrared will.\n\nSecond, infrared is at frequencies which are close to various rotational and vibrational frequencies of molecules. (By "frequencies" I mean those based on Quantum Mechanics and calculated exactly, and not  in the vague way used by various pseudo-science theories and new age types.) So passing a lot of infrared into something dense like a metal will lead to the photons being absorbed by the molecules and the whole thing will heat up a bit.\n\nOn the other hand, *some* infrared will pass through materials - like the side of a house - and can be detected on the otherside. But to detect this you need to really amplify the signal. A clear detection is not very strong.\n\nAs for the second part of your question, you are right that X-rays, where the frequency is higher and the wavelength smaller, can zoom right through a metal. They are more likely to be absorbed by a nucleus of particular atoms.
102260
The photon would give its energy to the atoms' kinetic energy.  in otherwords, the photon would be captured by the nucleus causing the nucleus to fly off faster.
504322
You can think of x-rays as high energy light.  They pass right through the soft tissue of body, but not the bones.  After passing through the body, they are focused on regular photographic film then developed like a regular photo.
569621
infrared ray=a ray of infrared radiation; produces a thermal effect (as from an infrared lamp)\nLED=light-emitting diode: diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used