Yes! In this case (l) = 0.10X10-9 m
E = hc/l = (6.63X10-34)(3.00X108/0.10X10-9
= 1.2X 10-15 J

 The CJOY photon from Q 2 had energy 9.68X10-28 J.
Number of CJOY photons required to make the energy of one X-ray photon
= 1.2X10-15/9.68X10-28 = 2.1X1012

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