FYKOS Year 33 Series 1 Problem 3 — infrasauna · FYKOS 33 #33.1.3
Physics · mechanics · thermodynamics
Problem
Dano continues with equiping of his mansion with another sauna–-this time an infrasauna.
He wants to place a tube lamp right underneath the ceiling of the sauna which is H=2.5m
above the ground. Suppose the source of radiation emits energy with the power per unit length of
p=1.2kW⋅m−1, a radiation of what intensity would reach the skin of a
person situated approximately h=50cm above ground? The lamp is a straight tube,
shines in a homogeneous manner and reaches from wall to wall just under the middle of the ceiling.