Thermal Radiation from Human Body. We covered all the Thermal Radiation from Human Body in this post for free so that you can practice well for the exam.
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MCQ on Thermal Radiation from Human Body for Students
According to Prevost’s theory of heat exchanger, the body exists and absorbs radiant energy continuously as long as its temperature is
1. 4° K
2. 0°K
3. 4° C
4. None of these
Option 2 – 0°K
The thermal radiation emitted by the body per unit of time and per unit of the surface area depends on the nature of
1. Temperature
2. Kinetic energy
3. Surface and temperature
4. None of these
Option 3 – Surface and temperature
Thermal radiations exhibit the following phenomenon
1. Interference
2. Diffraction
3. Polarisation
4. All above
Option 4 – All above
A perfect black body is one which completely absorbs all the radiations of all wavelengths but only
1. reflect
2. transmit
3. reflect and transmit
4. None of above
Option 3 – reflect and transmit
Stefan’s-Boltznam law states that the total amount of radiant energy emitted by a black body per second per unit area is.
1. Inversely fourth power of absolute temperature
2. Inversely second power of absolute temperature
3. The direct fourth power of absolute temperature
4. The fourth power of only temperature
Option 3 – The direct fourth power of absolute temperature
The radiation of a particular wavelength’s temperature is raised the maximum intensity of emitted is radiation towards the shorter wavelength side is called
1. Wien’s displacement law
2. Stefan’s law
3. Rayleigh-Jean’s law
4. Planck’s law
Option 1 – Wien’s displacement law
At what rate is the energy radiated by a sphere of radius 5 cm at 3000°K and with 100% and with an emissivity of 0.3?
1. 4000 watts
2. 43280 watts
3. 4328 watts
4. None
Option 2 – 43280 watts
The average human body may be considered to have a surface area of 1.25 cm² and a surface temperature of 32°C assuming emissivity to be 1. calculate the rate of energy loss by the human body
1. 100 Calories
2. 158 Calories
3. 146.11 Calories
4. 76.11 Calories
Option 3 – 146.11 Calories
The luminosity of a star is 20,000 times that of the sun, if the surface temperature of the sun, is 6000°K, find the surface temperature of the sun star.
1. 6000°K, 84,860°K
2.5986°C, 84,860°C
3. 6000°K, 59000°C
4. None
Option 1 – 6000°K, 84,860°K
We covered all the thermal radiation from human body above in this post for free so that you can practice well for the exam.
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