Energy of n-Photons: Find Equation

[HeisenbergC]

Homework Statement

Write down equation for energy of n-photons

Relevant Equations

\sum_{n=1}^{\infty }nhf

Hi, can anyone help me with this problem? Find equation for energy of n-photons
Thank you.

 

[DrClaude]

Can you give the full text of the question? There seems to be something missing.

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