Question

What are the major energy transformations that occur between when energy starts from a primary energy source, becomes a piece of wood , which is then burned in a fire?


A. Chemical energy to heat and light energy


B. Light energy to chemical energy to mechanical energy to heat and light energy.


C. Light energy to chemical energy and then chemical energy to heat and light energy.


D. Geothermal energy to chemical energy and then chemical energy to heat and light energy.

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Answer 1

Answer:

In the case of burning wood, stored potential energy (in the form of chemicalenergy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustionand requires oxygen. Combustionchanges the potential chemical energyinto kinetic energy in the form of heat.

Answer-A

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Answer 2

Answer:

option C

Explanation:

The primary source of energy for this chain of transformations comes from the Sun, which is transformed into chemical energy stored in the wood through photosynthesis.