Need clarification

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I'm reading a modern physics textbook, and have trouble understanding this sentence:
"Oscillators in the cavity walls can interchange energy with standing waves in the cavity only in quanta of hf"
What is meant by that?
 

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James R
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For "oscillators" read "atoms"; for "quanta" read "photons"; for "hf" read "energy hf, where f is the frequency".
 
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It means that for a fixed frequency, the energy exchange may only occur
as integer multiples of hf, that is hf, 2hf, 3hf ...

Note: The "walls" means the electrons or atoms or molecules of the walls.
It could even mean other things. A quantum oscillator is anything that
can be excited into a state of definit energy (frequency) like the vibrational
states of a molecule.
 
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oh, i see~
thanks! :)
 

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