Answer / thiru

we use amplifiers and electronics circuits for constructing
mobile phones.so it generates heat while it working.

Answer / ashokkumar.a

all the bodies produce heat energy as the unwanted
wastages. not only body, the energies are converted from
one form to another form, in that process the heat is
liberated as the wastages of energy.. as same as the
frequencies are converted into sound energy and the energy
waste is in the form of heat energy.....

What is black body? : quantum physics

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