A human body has a surface area of approximately 1 m 2 . The normal body temperature is…
Physics · JEE Advanced · NTA Exams — Thermodynamics
A human body has a surface area of approximately
1 m2. The normal body temperature is 10 K above the surrounding room temperature T0. Take the room temperature to be T0 = 300 K. For T0 = 300 K, the value of σT04 = 460 W m–2 (where σ is the Stefan Boltzmann constant). Which of the following options is/are correct?
1 m2. The normal body temperature is 10 K above the surrounding room temperature T0. Take the room temperature to be T0 = 300 K. For T0 = 300 K, the value of σT04 = 460 W m–2 (where σ is the Stefan Boltzmann constant). Which of the following options is/are correct?
- If the body temperature rises significantly then the peak in the spectrum of electromagnetic radiation emitted by the body would shift to longer wavelengths
- If the surrounding temperature reduces by a
small amount DT0 < < T0, then to maintain the same body temperature the same (living) human being needs to radiate DW = 4sT03DT0 more energy per unit time - The amount of energy radiated by the body in
1 second is close to 60 Joules - Reducing the exposed surface area of the body (e.g. by curling up) allows humans to maintain the same body temperature while reducing the energy lost by radiation.
Answer
(D) Reducing the exposed surface area of the body (e.g. by curling up) allows humans to maintain the same body temperature while reducing the energy lost by radiation.
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