Question

im just wondering how to approach the question using those equation shown on thr bottom and why we dont use the number 139 MeV/c^2

Question 4 (5 pts): An unstable particle called a pion is made up of a quark and antiquark pair, and pions can be created in particle physics experiments when very energetic particles collide with one another. If the mass of the pion is 139 MeV/c2 and the pion lasts only briefly with an average lifetime of 2.6x 10 s then O what would be our minimum uncertainty in its measured mass? AE At /2m a) 139 MeV b) 11.8 MeV c) 9.7 x 1011 eV/c d) 2.5 x 10 eV/c e) 1.6 x 105 eV/c 2 (EFne 4E Ame Am AE 9 A 6.63x10が.S C X 2 Tx 2.6x1 lev X .602X10 = 2.5 %ev/c 2 -04 AF

Answer 1

So! Option (d) is corr ct. The solutiom hee is done ight 139 eV is the uit of emeigy Now ot 1 1 af mass we have to fnd the uncotanty not the oct ual mass. also ond im mass 7 Uncatainty n mass is that how nad eror im cal culating the mass