frequency of photon

[epichiot]

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i had a practice question looking for the minimum frequency of two photons, which have the same energy, after an electron and positron annihilate each other and all matter is converted into energy.

i am given h, c, and the mass of 9.1x10^-31 but I just cant figure out how to find frequency.

 

[G1SG2]

i had a practice question looking for the minimum frequency of two photons, which have the same energy, after an electron and positron annihilate each other and all matter is converted into energy.

i am given h, c, and the mass of 9.1x10^-31 but I just cant figure out how to find frequency.

E=h*f, where h is planck's constant, E is the binding energy, and f is the frequency. First use E=mc^2 to find the binding energy (c is the speed of light, 3 x 10^8 m/s), then plug that into E=hf to find the frequency.

So, mc^2=hf, f=mc^2/h.