Is the Energy Change in a Bohr Atom Always Equal to One Photon?

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Vishera
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From Wikipedia, the following diagram explains the energy emitted when an electron jumps from a higher-energy shell to a lower-energy shell:
500px-Bohr-atom-PAR.svg.png


I already know that the energy of a single photon is equal to ##hf## and in this diagram, ##\Delta E=hf##. Does that mean that ##\Delta E## is only one photon?
 
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Yes, a "downward" transition between two energy levels produces a single photon.
 
jtbell said:
Yes, a "downward" transition between two energy levels produces a single photon.
It does not have to, but this is the typical case, yes.