The basal metabolism of a human adult is the total rate of energy production when a person is not performing significant physical activity. it has a value around 125 w, most of which is lost by heat conduction to the surrounding air and especially to the exhaled air that was warmed while inside the lungs. given this energy production rate, it would seem impossible for a human body to radiate 460 w as you calculated in the previous part. which of the following alternatives seems to best explain this conundrum?
a. the human body is quite reflective in the infrared part of the spectrum (where it radiates) so is in fact less than 0.1.
b. the surrounding room is near the temperature of the body and radiates nearly the same power into the body.
momentum can be explained by a game of pool. a ball which is hit by the rod moves with certain mass and certain velocity. that ball hits another one and makes it move, also. so by giving it acceleration, a transfer of momentum is made.
answer : to provide heat.
infrared waves are the waves having wavelength 700 nm to 1 mm.
the most common use of infrared waves is "to provide heat" i.e. in heat-sensitive thermal imaging cameras. it is a invisible wave. it can only sensed by a sensation of warmth.
for example :
when an object is hot, it will emit energy in the form of infrared waves.
so, correct option is (b)
correct answer is b(edwin hubble)
the work of subrahmanyan chandrasekhar is likely to have been most influenced by edwin hubble because both have worked in the feild of astrophysics.
subrahmanyan chandrasekhar was an astrophysicist. he belons to india. he is known for his work on the theoretical structure and evolution of stars. subrahmanyan chandrasekhar with william fowler won the nobel prize in physics in 1983 largely for this early work. he has worked in many other areas within theoretical physics and astrophysics.
edwin hubble was an astronomer who belongs to america. he is known for hubble law. hubble discovered that many objects which was thought to be clouds of dust and gas were actually galaxies beyond the milky way. he has an important contribution in establishing the fields of observational cosmology and extra galactic astronomy