The mass spectrograph is a laboratory device which allows in particular to separate isotopes. Bromine-79 and Bromine-81 ions are produced in the ionization chamber, which diffuse with negligible speed into a chamber where they are accelerated. What sign of U = V2 - V1 must be applied between the plates P1 to P2 so that the ions are accelerated? The electrostatic force must be from P1 to P2 and the electromagnetic field from P2 to P1 since F = qE and q<0. E being oriented in the direction of decreasing potentials therefore Vp and U >0 Calculate the speeds V1 and V2 for each ion. We give the masses: m1= 1.31 x 10^-25 kg m2= 1.34 x 10^-25 kg |u| = 4 x 10^3 V q = -e

The mass spectrograph is a laboratory device which allows in particular to separate isotopes. Bromine-79 and Bromine-81 ions are produced in the ionization chamber, which diffuse with negligible speed into a chamber where they are accelerated. What sign of U = V2 - V1 must be applied between the plates P1 to P2 so that the ions are accelerated? The electrostatic force must be from P1 to P2 and the electromagnetic field from P2 to P1 since F = qE and q<0. E being oriented in the direction of decreasing potentials therefore Vp and U >0 Calculate the speeds V1 and V2 for each ion. We give the masses: m1= 1.31 x 10^-25 kg m2= 1.34 x 10^-25 kg |u| = 4 x 10^3 V q = -e

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