We know that the mass of the log before burning is 5 kg.
After it is burnt, the mass of the ash comes out to be 1 kg. So there is a
definite mismatch of 4 kg. When the log is burnt, there is the formation of
smoke. The air and water present in the wood vaporises to reduce the weight
significantly. The combustion actually leads to the formation of carbon dioxide
that mixes with the air and also water. The extra mass thus goes into the
formation of carbon dioxide and water.
According to a source, fringes is the answer. These fringes are what causes dark regions in the double -slit experiment conducted that can be observed in the screen. Thank you for your question. Please don't hesitate to ask in Brainly your queries.
