If a black body is heated 27°C to 927°C. Then the ratio of radiation emitted will be (a) 1:4 (b) 1:16 (c) 1:8 (d) 1:256
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- 3. Given that the internal energy U of blackbody radiation in a cavity of volume V at temperature T is given by U = aVT, where a is independent of both V and T, show by thermodynamic reasoning that the free energy, F, and the entropy, S, of the radiation must have the forms: -jaVT* + Tf(V) F = s = aVT° - {(V) 4 where f(V) is an unknown function of V. Assuming S vanishes at T = 0 (because there is no radiation) or assuming the third law of thermodynamics: as (), as T + 0 av show that the radiation pressure is given by 1 U P = 3 VThe temperature of a student's skin is 33.0°C. At what wavelength does the radiation emitted from the skin reach its peak? umThe blackbody radiation emitted from a furnace peaks at a wavelength of 2.7 10-6 m (0.0000027 m). What is the temperature inside the furnace? K?
- The frequency of yellow light is 5.08 * 10 ^ 14 * H_{Z} . How much energy does a photon of yellow light carry? (h=6.626*10^ -34 J* s;1 eV=; 1.60*10^ -19 j)Consider a black body of surface area 20.0 cm2 and temperature 5 000 K. (a) How much power does it radiate? (b) At what wavelength does it radiate most intensely? Find the spectral power per wavelength interval at (c) this wavelength and at wavelengths of (d) 1.00 nm (an x- or gamma ray), (e) 5.00 nm (ultraviolet light or an x-ray), (f) 400 nm (at the boundary between UV and visible light), (g) 700 nm (at the boundary between visible and infrared light), (h) 1.00 mm (infrared light or a microwave), and (i) 10.0 cm (a microwave or radio wave). ( j) Approximately how much power does the object radiate as visible light?For years, exposure to ultra-violet radiation from prolonged time in the sun has been the major identified cause of skin cancer. New research is showing that ultra-violet is not the only type of radiation from the sun that can increase the risk of skin cancer. Rates of skin cancer among pilots are twice that of non-pilots, but the glass used in planes blocks most the ultra-violet radiation. Pilots are also exposed to x-rays from the sun during flight. The x-rays that pilots are exposed to in one day of work are equivalent to a chest x-ray. Although getting an x-ray for medical reasons is believed to be safe, researchers believe that the frequent exposer that pilots experience increases their risk for skin cancer. The Electromagnetic Spectrum IMHE IGHE Fregiency r 10 10 10 1e 10 10" 10 10 10" Camme wened Wwwdengih in 10 10 10 1 10 10 10 10 o* 10* 10 10 10 19" 1e 10 1o Ikm Imm Tum Inm Ipm Use your knowledge of the electromagnetic spectrum to support the claim that pilots are at a greater…
- A black body has an area of 10.0 cm2 what is the power radiated when its temperature is 5000 K.The blackbody radiation emitted from a furnace peaks at a wavelength of 5.5 x 10^ -7 m. What is the temperature inside the furnace ?The radius of our Sun is 6.96 x 10° m, and its total power output is 3.85 x 1014 terawatt (TW)- a) Assuming the Sun's surface emits as a black body, calculate its surface 15 temperature. b) Using the result of part (a), find Amax for the Sun. c) If the sun works as transmitter, how many photons per second does the sun emit at Amax?
- At what frequency is the radiation from a black body maximum if the temperature of the object is 1700 degrees Kelvin? Choose the response closest to the correct answer. Question 11 options: 10^3Hz 10^4Hz 10^7Hz 10^8Hz 10^13Hz 10^14HzAt a wavelength of 0.7 mm, the black body emissive power is equal to 108 W/m3. Determine (a) the temperature of the blackbody and (b) the total emissive power at this temperature.The power emitted by a blackbody is proportional to T^4. If the temperature of the blackbody goes from 3000K to 6000K, by how much (by what factor, 2, 3, 8, etc) does the power increase?