The To term comes from the fact that we don't radiate into a vacuum like stars do, but we radiate into an already warm medium (say air at a room temperature of To = 20 degrees C) Without measuring, estimate the surface area of your body, A. Use this answer to calculate your energy loss rate. A Mars bar contains 1888 kJ of food energy (www.marsnutrition.co.uk). Using order of magnitude estimates, calculate the energy loss unit of Mars bars per day in Joules per second, then compare it against your calculator answer. How many Mars bars a day do you radiate? Checkpoint 1: What is your body surface area and energy loss rate? How did you estimate your surface area?
The To term comes from the fact that we don't radiate into a vacuum like stars do, but we radiate into an already warm medium (say air at a room temperature of To = 20 degrees C) Without measuring, estimate the surface area of your body, A. Use this answer to calculate your energy loss rate. A Mars bar contains 1888 kJ of food energy (www.marsnutrition.co.uk). Using order of magnitude estimates, calculate the energy loss unit of Mars bars per day in Joules per second, then compare it against your calculator answer. How many Mars bars a day do you radiate? Checkpoint 1: What is your body surface area and energy loss rate? How did you estimate your surface area?
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Plz show full explanation and working with steps. Clear writing also to help with revision. This is 1 question I should add just with related parts. Thanks
Transcribed Image Text:1.1. How Hot Are You?
We've been using the Stefan Boltzmann Law to calculate the luminosity of very big, very hot
objects. But we can use it to estimate other things, such as how much radiation a human being
puts out.
Your skin temperature is approximately 33 degrees Celsius. Assuming you are a blackbody and
using Wien's Law, what is the peak wavelength at which you emit electromagnetic radiation?
The Stefan Boltzmann law says that the energy lost per unit time by a radiating blackbody is the
surface area of the body multiplied by the Stefan Boltzmann constant, multiplied by the body's
effective temperature to the fourth power, i.e.
L = Ao(T – T)
The To term comes from the fact that we don't radiate into a vacuum like stars do, but we radiate
into an already warm medium (say air at a room temperature of To = 20 degrees C)
Without measuring, estimate the surface area of your body, A. Use this answer to calculate your
energy loss rate.
A Mars bar contains 1888 kJ of food energy (www.marsnutrition.co.uk). Using order of magnitude
estimates, calculate the energy loss unit of Mars bars per day in Joules per second, then
compare it against your calculator answer.
How many Mars bars a day do you radiate?
Checkpoint 1: What is your body surface area and energy loss rate? How did you estimate
your surface area?
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