Understanding the Quantum of Light: The Mystery of Photons Explained

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I am confused. Hot many photons are to each wave of light? Is there only one, like I thought, or are there many?
 
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That's a tricky question - what exactly is "one wave of light"?
Each photon carries an energy of hf (f=frequency), so if you have light of a certain wavelength with a well-defined amount of energy, it is easy to find out how many photons it carries.
However, if you have coherent light (like that emitted from a laser), it does not have a definite number of photons in it - coherent light has to exist in a superposition state of different photon numbers; otherwise it could not be coherent.
 

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