Question

(a) If the human body acts like a blackbody, use Wien’s displacement law (see problem 45) to calculate the body’s wavelength of maximum emission. Assume an average skin temperature of 34°C.

(b) In what part of the electromagnetic spectrum is the light?

Answer 1

(a) 9439.8 nm

(b) infrared

Step-by-step explanation:

Temperature, T = 34°C = 307 K

(a)

According to the Wein's displacement law

`\lambda _(m)* T = b`

where, b is the Wein's constant.

b = 2.898 x 10^-3 metre kelvin

λm x 307 = 2.898 x 10^-3

λm = 9.44 x 10^-6 m = 9439.8 nm

(b) it lies in infrared radiation.