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(C) The energy of a photon is given by $E = \frac{hc}{\lambda}$. Since both photons have the same wavelength $\lambda$,they must have the same frequen

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Method of creation

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(C) The energy of a photon is given by $E = \frac{hc}{\lambda}$. Since both photons have the same wavelength $\lambda$,they must have the same frequency and the same energy. Consequently,their penetrating power,which depends on energy,is also the same. However,the method of creation is fundamentally different: continuous $X$-rays are produced by the deceleration of electrons (Bremsstrahlung),while characteristic $X$-rays are produced by electronic transitions between discrete energy levels within the atom.

Consider a photon of continuous $X$-ray and a photon of characteristic $X$-ray of the same wavelength. Which of the following is different for the two photons?

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