If the Sun is sending a flux of light,would you receive less heat on you body if you were runing?
367855
when you stand in the sun and get warm, it is because your skin absorbs the electromagnetic radiation we call light.  light is both a wave and a particle - called a photon.  photons have no mass, but they do carry energy.  when the photon is absorbed by your skin, the light energy is converted into (mostly) heat energy.\n\nanyway, it should'nt make a difference whether you are moving or not.  strictly speaking there are a few effects to consider but i would think they are very small.  for example:\n\n - the further you are from a light source, the dimmer it appears, and therefore the less light you absorb.  so if you are running away from the sun and you have a fixed effective area, then on average you will receive less solar flux than if you are just standing there.  however this is a tiny amount in terms of moving around on the surface of the earth.\n\n- conceivably if you are moving away from the sun, there will also be an effective doppler shift of the light, which will (slightly) shift the solar spectrum into the red.  since redder light has a lower energy, you should effectively absorb less energy, but the absorption spectrum of the skin should be considered.  also unless you are the flash, this effect will also be tiny because humans run so slow.\n\nthe energy that you DO absorb gets carried away from your body by several mechanisms:\n\n - radiation:  you (and all things) radiate light energy in the infrared.  this is called "blackbody radiation" and is a function of your temperature.  (blackbody radiation is why hot things glow orange, for instance.)\n\n - evaporation:  your skin sweats, and the sweat evaporates.  this evaporation requires some heat, which effectively cools down your skin.\n\n - conduction:  if you are standing perfectly still in air that is not moving, your body will warm up a layer of air molecules around your skin.  this warm air will rise, and cooler air will move in to replace it.  this is actually probably why it *feels* like you're cooler if you're running around: more wind = more cool air = more heat loss.
575202
heat is a form of energy.
189753
That actually depends...Black as a color readilly absorbs heat so wearing black clothes would really be warmer. Now, you may wonder why Middle Eastern people wear those heavy looking dark robes...in the middle of the friggin desert? As mentioned black or dark colors absorb heat faster than light colors. So what happens is that those robes absorbs heat faster than the surrounding area. Warm air, as you know, rises. Thus those robes create a well ventilated zone. Being warmer than the surrounding area... cooler air rushes in or displaces the warm air...creating a light breeze.
963835
the body is not very good at changing energy into movement\n3/4 of the energy used to move muscles is turned into heat instead of moving the muscle\nthis heat is what makes you warm
653102
Qualitative answer:\n\nConsidering that the flux from the sun on average is 600 W/m^2 here in Hawaii, and that you can get sunpoisoning from not wearing sunblock between 11-1p, I would say that the length of time a person could stand this kind of intensity would be extremely little.  In fact, the measurement you gave was on the order of some lasers that are currently used in the medical field.  For example, a carbon dioxide laser produces between 1000-1400 (typically 1200) W/cm^2 intensity level.  I would have to conclude this level of power would sear skin INSTANTLY.  Not something you want to deal with...
1183093
sun bathing is radiation. sun radiation travel through space(no air in space so it is pure radiation energy transfer), travel through air (in there also radiation is dominant ) then get in to your skin\n\nstroform is a good insulater. it has hollo set of chambers. in chambers covection can be done but cells prevent transfer of air further and convection is stoped. in the other hand conduction is prevented due to poor conductivity of material. radiation is not a problem when heat difference is not too much high and because radiation generated from a object is is propotional to absolute heat  of the object. in case of very high temperature allumenium foil is used to limit radiation.
1089406
That's becuase it will enhance the effects of the sun. You will burn faster.
318431
Atmosphere has a very low heat capacity compared to hydrosphere. It will react strongly on short term (well below diurnal) changes, like insolation (amount of energy absorbed by the sun).
127947
Sun on your skin can make you warmer than the ambiant tempurature. When you are outside you feel the sunlight in addition to the 65 degrees.\n\nAlso, your body measures warmth in relations to experiences.  Your body knows what normal room temp feels like.  If its colder than that, you feel cold.  Same when you go outside.\n\nI hope that all made sense.
655580
no, it is infared light, which is lower energy than regular light. plus it is a very weak, un focused siganl that only transmits for an instant.
911532
Ok you need a bowl of water and the sun. The energy is trapped (at least temporarily) in the water, as heat.
475577
You would surmise, that since the sun is the source of the heat for the\nearth and atmosphere, that the atmosphere should be warmer at points closer\nto the sun, like at the TOP of the atmosphere, instead of the reverse.\n\n   But the atmosphere is not warmed directly by the sun...it is warmed by the\nEARTH...!  Most of the energy from the sun arrives at the earth in the form\nof light energy, or short-wave energy. The atmosphere is transparent to\nshort-wave energy, and most of the solar energy reaches the surface of the\nearth, where it is absorbed. This energy warms the surface of the earth,\nwhich, in turn, warms the atmosphere with long-wave energy. The type of\nenergy radiated by a star primarily depends on the temperature. So the\nenergy from the sun arrives at the earth as short-wave (in the visible part\nof the spectrum) energy, and leaves the earth as long-wave (in the infra-red\npart of the spectrum) energy.\n\n   The atmosphere is not transparent to long-wave radiation, and absorbs the\nheat energy from the earth. That part of the atmosphere closest to the earth\ngets the most energy and is the warmest.\n\n   Because the sun is nearly overhead in the latitudes nearest the equator,\nthose locations receive more solar energy per unit area, and become warmer\nthan those locations near the poles. This difference in the amount of energy\nreceived and subsequent heating of the atmosphere and evaporation of water\nfrom the lakes and oceans, is what drives the "weather machine" on the\nearth.
566203
Actually, when you really think, yes\n\nAs you probably know already, the sun's rays, depending on color and object, can be reflected or absorbed. White reflects sunlight and black absorbs it. \n        But, sunlight can also reflect off of certain objects too, like a mirror, for example. In your case, the windows serve as a mirror, so, they reflect sunlight, keeping the sun away from you. But, one thing, it doesn't block out UVs. So, you might not feel much sun, but slab some sunscreen on just incase.
138271
This question has two different answers depending on how you read it.  The intensity of the light that reaches you will be reduced as you move away from it, but the intensity of the source stays constant.  Its a matter of perspective, so therefore the preson who asked you this question should clarify it for you.  I'd write both answers and explain each.  Your teacher should except that.
1040095
heat radiation is possible in a vacuum, thats how the suns energy reaches us
89461
Yes.\n\nThe body cools itself by evaporation of perspiration from the skin.  In dry air, perspiration evaporates rapidly causing a cooling affect but in humid air, perspiration evaporates less quickly so you don't feel as cool.  You'll feel warmer at the same temperature in a humid climate.\nhttp://en.wikipedia.org/wiki/Humidity#Effects_on_human_body\n\nIn it's simplest form, the "heat index" attempts to capture this property of perceived temperature by factoring humidity and temperature into a single value.\nhttp://en.wikipedia.org/wiki/Heat_index\n\n\nSome of the weather services such as Accuweather have devised ways of expressing the perceived temperature that include multiple factors including: "ambient temperature, wind speed, solar intensity, humidity, precipitation intentisty/type, elevation, and atmospheric pressure".  The purpose of this is to try and include all factors that might affect how we perceive temperature.\nhttp://www.accuweather.com/iwxpage/adc/help/pr_realfeel_pr.htm\nhttp://wwwa.accuweather.com/company.asp?page=about\n\nWeather.com has their "Feels Like" temperature rating which is similar.\n\n\nOf course, there are situations where it is so hot that it doesn't matter about the humidity.
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.