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**Hi, stuck on this question, hoping someone could help**

1. Homework Statement

1. Homework Statement

Two identical photons of wavelength 4.22x16^-7m are created when a certain amount of matter M, is converted into energy, calculate the Mass (M)

## The Attempt at a Solution

E= hf which is hc/wavelength

E= 4.71x10^-19J

E= mc^2

so M= E/c^2

M= 4.71x10^-19J/ 3.00x10^8^2

M= 5.23x10^-36 kg

BUT the answer is 1.047x10^-35 kg, how?

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