Is there a rule for the number of photons emitted when a matter particle and a corresponding anti-matter particle annihilate?

Question

experimentx · Answer

hv = e = mc^2
hv = mc^2

anonymous · Answer

when a matter particle and a corresponding anti-matter particle annihilate they change completely into energy..
E=mc^2...
this energy comes out as photons (say of frequency f),then
nhf=E..
where n is no of photons..thus we can calculate the total no of photons..

experimentx · Answer

seems like i forgot the basics ... lol

anonymous · Answer

happens to everyone, someday or the other :)

experimentx · Answer

;)