I WANT THE RIGHT ANSWER PLZ A 670cmdiameter cyclotron uses a

I WANT THE RIGHT ANSWER PLZ!!!

A 67.0-cm-diameter cyclotron uses a 520 V oscillating potential difference between the does. What is the maximum kinetic energy of a proton if the magnetic field strength is 0.760 T? Express your answer with the appropriate units. How many revolutions does the proton make before leaving the cyclotron?

Solution

a) v = q B r / m = (1.6 * 10^-19 * 0.76 * 0.335) / (1.67 * 10^-27) = 2.44 * 10⁷ m/s

E_k = 1/2 m v2 = 1/2 * 1.67 * 10^-27 * (2.44 * 10⁷)²

= 4.97 * 10^-13 J

b) N = E_k / (2 q V)

N = 4.97 * 10^-13 / (2 * 1.6 * 10-¹⁹ * 520)

N = 2987 rev