Homework Answers
Answer : 2nd option:
Radiation is a mode of heat transfer which becomes significant only at above 1000K therefore its importance becomes negligeble at room temperature.
we know that for a opaque body : transmissivity becomes 0. that means sum of absorpivity and reflectivity equals 1.
Black body is assumed to emit maximum radiation keeping its temperature fixed but not the size.It is more clearly defined as the value obtained when radiation emitted by this black body at a certain temperature is integrated between 0 to Lamda(wavelength) .
Radiation emitted by a body is proportional to the 4th power of absolute temperature as per stefan boltzmann law.
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Hi
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some context
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The rate of heat transfer by emitted radiation is determined by the Stefan-Boltzmann law of radiation = ceAT4 t where a 5.67x108 J/(s m2. K4) is the Stefan-Boltzmann constant, A is the surface area of the object, and T is its absolute temperature in kelvin. The symbol e stands for the emissivity of the object, which is a measure of how well it radiates. An ideal jet-black (or black body) radiator has e 1, whereas a perfect reflector has e...
what are the fundamental assumptions needed to apply heat
transfer, radiation circuit analysis theory?
DI Question 3 8 pts Select any of the assumptions listed below that are always required when developing a radiation network analysis. O Highly reflective surfaces Non-participating medium Opaque surfaces O Insulated surfaces O Gray surfaces DI Question 4 8 pts The figure below is the sp blackbody (solid line) at 500 K, and for a real surface (dashed line) at the same temperature as the...
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Hi
please solve all of these physics problems on the sheet. Thank you.
601 The temperature of an object is best described as the a) heat content of the object. b) heat transferred to the material. e) total kinetic energy per kilogram of material d)average random kinetic energy per particle. 61] Compared to a blue star in the same local cluster, the surface temperature of a red star is a) greater. b) the same. c) lower. d) not consistently any...
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some context
Problem 3: Use simple kinetic theory of gases discussed in section 1.3.2 as well as Fourer's law of condustion to prove: 2 R373 D11 = 3113/202pm Dal We were unable to transcribe this imageof a nes. the xed the led negligible The following assumptions about the structure of the cases are made in order to investigate the statistical rules of the random motion of the molecules: The size of the gas molecules is negligible compared with the distance...
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