Answer to Question 3

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In a particle physics experiment, a detector is placed in a magnetic field of 0.92 T.  A particle is found to produce a curved track of radius 0.5 m.  Other experiments have shown that the particle carries a charge of +1.6 10-19 C and that its speed was 3.0 107 m/s.  What is the mass of the particle?  How does it compare to the mass of an electron (9.11 10-31 kg)?    

m = Bqr/v = 0.92 T 1.6 10-19 C 0.5 m = m = 2.45 10-27 kg

                            3.0 107 m s-1

 

Ratio = 2.45 10-27 kg 9.11 10-31 kg = 2700 times the mass of an electron