61. Thermography is a technique for measuring radiant heatand detecting variations in surface temperatures thatmay be medically, environmentally, or militarilymeaningful.(a) What is the percent increase in the rateof heat transfer by radiation from a given area at atemperature of 34.0°C compared with that at 33.0°C,such as on a person's skin? (b) What is the percentincrease in the rate of heat transfer by radiation from agiven area at a temperature of 34.0°C compared withthat at 20.0°C, such as for warm and cool automobilehoods?

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If the body’s surface temperature is 35 degrees Celsius, what is the net rate of heat loss on a chilly 4 degrees Celsius day. All human skin is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.97.
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