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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
Based on Prevost’s theory of Heat exchange, a body continues to emit and absorb radiation unless its temperature reaches
a) 4 K
b) 0 K
c) 4°C
d) None of the above
Option b – 0 K
The amount of thermal radiation a body emits per unit time and surface area is influenced by
a) Temperature
b) Kinetic energy
c) Its surface properties and temperature
d) None of the above
Option c – Its surface properties and temperature
Thermal radiation demonstrates which of the following characteristics?
a) Interference
b) Diffraction
c) Polarization
d) All of the above
Option d – All of the above
An ideal black body is defined as one that absorbs radiation of all wavelengths and only
a) Reflects
b) Transmits
c) Reflects and transmits
d) None of the above
Option c – Reflects and transmits
According to Stefan-Boltzmann’s law, the energy radiated per unit area per second by a black body is
a) Inversely proportional to the fourth power of absolute temperature
b) Inversely proportional to the square of the absolute temperature
c) Directly proportional to the fourth power of the absolute temperature
d) Proportional to the fourth power of temperature alone
Option c – Directly proportional to the fourth power of the absolute temperature
The phenomenon where increasing temperature shifts the peak radiation intensity to shorter wavelengths is described by
a) Wien’s displacement law
b) Stefan’s law
c) Rayleigh-Jeans law
d) Planck’s law
Option a – Wien’s displacement law
How much energy is radiated per second by a spherical object with a radius of 5 cm, a temperature of 3000 K, and an emissivity of 0.3?
a) 4000 watts
b) 43280 watts
c) 4328 watts
d) None of the above
Option b – 43280 watts
Consider the human body to have a surface area of 1.25 m² and a surface temperature of 32°C. Assuming the emissivity is 1, what is the estimated rate of energy loss?
a) 100 Calories
b) 158 Calories
c) 146.11 Calories
d) 76.11 Calories
Option c – 146.11 Calories
If a star’s luminosity is 20,000 times that of the sun and the sun’s surface temperature is 6000 K, what is the surface temperature of the star?
a) 6000 K, 84,860 K
b) 5986°C, 84,860°C
c) 6000 K, 59,000°C
d) None of the above
Option a – 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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