10 MeV কে J এ রুপান্তর করতে হবে।
E= 10×106×1.6×10-19=1.6×10-12
E =(m-m0)c2
or, 1.6×10-12= (m-m0)c2
or, (m-m0)= 1.6×10-12/ c2
or, (m-m0)= 1.77×10-19
or, m/m0 -1= (1.77×10-19)/m0
or, m/m0 = 19.51+1
or, m= 20.51m0
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