Suppose we want to design an instrument that distinguishes between a person whose body temperature is normal, at 36.7 de
Posted: Thu Apr 28, 2022 9:45 am
Suppose we want to design an instrument that distinguishes
between a person whose body temperature is normal, at 36.7 degrees
Celsius, and a person with a fever of 39.9 degrees Celsius.
Approximate the human body as a blackbody of emissivity 0.92, and
determine the following:
a) What is the absolute difference in peak wavelength between
the spectra emitted by the two people? (Report your answer in
nm)
b) What is the ratio of the radiated power per unit area from
the two people? (Report your answer to 3 decimal places)
c) Roughly sketch the spectra that you would expect the two
people to emit (do not worry about the scale -- the important
information to show is the relative scale of the two curves and the
location of the peaks -- you can also use words to highlight the
difference between the two curves if you're not confident about
your sketch.)
NOTE: Can you please explain and show where
each numerical value and calculation is coming from.
Thanks.
between a person whose body temperature is normal, at 36.7 degrees
Celsius, and a person with a fever of 39.9 degrees Celsius.
Approximate the human body as a blackbody of emissivity 0.92, and
determine the following:
a) What is the absolute difference in peak wavelength between
the spectra emitted by the two people? (Report your answer in
nm)
b) What is the ratio of the radiated power per unit area from
the two people? (Report your answer to 3 decimal places)
c) Roughly sketch the spectra that you would expect the two
people to emit (do not worry about the scale -- the important
information to show is the relative scale of the two curves and the
location of the peaks -- you can also use words to highlight the
difference between the two curves if you're not confident about
your sketch.)
NOTE: Can you please explain and show where
each numerical value and calculation is coming from.
Thanks.