An ideal machine is one in which no part of the input energy to the machine gets wasted and the whole input energy is converted into the useful work. The <span>efficiency of such a machine is 100%.
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Calculate the energy (J) increase due to heating.
Then:
Use energy per photon = h f = (Planck's constant)(frequency)
frequency = (speed of light)/(wavelength)
Divide: energy gain/energy per photon = number of photons
It is a synthesis reaction where two reactants gives one product.
Answer:option D
2Mg + O2 ------> 2 MgO