6-7. In a mass spectrometer a singly charged positive ion (q = 1.602 X 10-19 coul). is accelerated through a potential difference of 1000 v. It then travels through a uni- form magnetic field for which B 0.1 weber/m2, and is deflected into a circular == path 0.182 m in radius. What is (a) the speed of the ion? (b) the mass of the ion, in kilograms and in atomic mass units? (c) the mass number of the ion?