The extent of radiation is measured in ____________units?
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I agree; c) is the right choice.  The other units are used to measure:\n\na)  power ratio\nb)  pressure\nd)  pressure (again)
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Electromagnetic radiation in the 1 to 1000 m wavelength range.
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is a meter for measuring total patient radiotherapy \nBelow are websites to look at for more info hope it helps good luck!!!\n\nhttp://www.osti.gov/energycitations/product.biblio.jsp?osti_id=20547028\n\nwww.thermo.com/com/cda/product/detail/0,1055,19650,00.html\n\nwww.jacmp.org/journal/include/getdoc.php?id=2951&article=159&mode=pdf \n\nwww.medscape.com/medline/abstract/16143797
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You need to get your units in a consistent form.  I suggest changing the velocity of the electron to 2.5E6 m/s so when you divide it into c-----------WAIT A MINUTE!-----Yor formula is NOT right, because you're dividing a speed by a speed, which will give a dimensionless answer.  Wavelength is a LENGTH, so the answer must come out that way.  I forget the formula you're refering to, but what you've typed isn't it................
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<>What, exactly, is the question?  Are you talking about radiation dosimetry?  Can you be just a iota (or ion :) more specific?
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Here is the data for the gamma rays (depending on energy).\n\nAluminium\n100 keV, 0.435 cm^-1\n200 keV, 0.324 cm^-1\n500 keV, 0.227 cm^-1\n\nLead\n100 keV, 59.7 cm^-1\n200 keV, 10.15 cm^-1\n500 keV, 1.64 cm^-1\n\nIf you need a graph over an larger domain of energies, look here:\n\nhttp://www.anst.uu.se/hanslund/Nuklidteknik/formelsamling.pdf\n\nI do not believe you will find similar data for alpha particles.
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The angstrom is one unit of measure.\nAstronomical Unit is another. (Au)\nParsec is another (PC)
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Radiance and spectral radiance are radiometric measures that describe the amount of light that passes through or is emitted from a particular area, and falls within a given solid angle in a specified direction. They are used to characterize both emission from diffuse sources and reflection from diffuse surfaces. The SI unit of radiance is watts per steradian per square metre (W·sr-1·m-2).
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Dosimetry is the measurement of doses in matter and tissue from ionizing radiation (radioactivity, alfa decay, gamma decay, beta decay).\n\nDoses are measured in grays (Gy) for matter or sieverts (Sv) for biological tissue. \n\nThe dose refers to the amount of energy or damage deposited in the matter, and should not be confused with the unit of radioactive activity (becquerel, Bq). \n\nDoses can be measured in places other than where the radioactive decay occurred.
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light density or intensity? if you're talking about intensity then it depends on distance. that's an inverse square relationship.
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There are several ways to measure radiation.  Usually, the effect of radiation is what is measured.  Radiation has several effects on living tissue.  When radiation interacts with a cell, one of four things can happen (1) cell is damaged and repairs itself and goes on to produce healthy daughter cells.  (2) cell is damaged and dies.  (3) cell is damaged produces daughter cells and they die. (4) cell is damaged produces damaged daughter cells that live and produce more like cells (aka cancer).  As I previously stated there are several ways to measure. (1) we can measure temperature increase and equate that to a flux based on what shielding we belive to be present.  We can take what we believe to be the source strength of the sun and calculate what it should be based on distance and shielding.  We can also do a statistical model of biological damage and work backwards to come up with required flux to produce such damage.
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Joules\n\nThis is taken as standard
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It is the SI unit of energy. It is also the unit for work in physics (force times distance). But I don't get the rest of your question.
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The usual unit is REMs or Sieverts. Both REMs and Sieverts are based on how human bodies absorb radiation and have a fairly complex definition involving absorption of different types of radiation by specific tissue types.  Other units, used for describing radioactive materials themselves, like Curies, are based on how much radioactive material is present, or what the rate of production of different types of radiation is.  \n\nHere's a good link on Sieverts:\n\nhttp://en.wikipedia.org/wiki/Sievert
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each magnitude corresponds to a ratio of 10^(-.2), so you want to multiply the (-.2) by (1.9) and look at 10 to that power. This gives the  fraction of photons that make the trip.\n\nHomework and repeat question.
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If you mean wavelengths, they vary widely from radio waves (at the low end) up to x-rays and gamma rays (at the high end).\n\nIf you mean "what are the wavelengths of VISIBLE light" here are their wavelenghts in nanometers (nm):\n\nred ~ 625-740 nm \norange ~ 590-625 nm \nyellow ~ 565-590 nm\ngreen ~ 500-565 nm \ncyan ~ 485-500 nm \nblue ~ 440-485 nm \nviolet ~ 380-440 nm
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The sun emits most of its radiation in a wavelength band between 0.1 and 4.0 micrometers (µm). The amount of radiation emitted from a body increases exponentially with a linear rise in temperature.\n \nSee fig 6f-2 in the link below\nhttp://www.physicalgeography.net/fundamentals/6f.html