Question

5. A researcher uses the ratio of three carbon isotopes (C-12, C-13, and C-14) in brain cells to determine whether or not new brain cells are formed during a person's lifetime. This can be done since the amount of radioactive C-14 has varied since the time of above ground nuclear bomb testing. The samples through a mass spectrometer. Inside the mass spectrometer the samples pass through a slit S1 and enter the region between a charged parallel plate with a constant electric field of 2.48 V/m and a constant magnetic field of 0.68 T. This is a velocity selector, that only selects particles of velocity pass through a second slit S2, and enter a region of uniform magnetic field, also set at 0 68 T. Look up the mass of each carbon isotope and determine the radial distance each isotope should appear at on the detector film are prepared and sent =E/B. The particles then S2 I + Sample B

Answer 1

Nao, aftee S2, the lorents agnetre fee Provrdesthe ecean cendipetoence fr ) mam sepenaten mu2 9uB 19 ELB tre1 fe ee nestal B 2 dtstance

fwe COndider all trotpes drple abanged 1-67x10-27 X %1 a X 16x16-19 2.48 2-12 (06P11 mass res OBmoten neubon 632% LO C-B 3n13 X I-67x02 X 2.4P -6 XL09 61L C-14, 14 x 167X624- 2.49 16K019 C-12 C3 14