In a mass spectrometer, singly charged neon ions start almost at rest and are sped up through $1.0\ \text{kV}$. They then pass through a slit $S$ into a uniform magnetic field of $0.20\ \text{T}$, at right angles to their motion, as in the figure. Each ion goes round half a circle and strikes a photographic plate that lies along the line through $S$. Neon has two main isotopes, of masses $20\ \text{u}$ and $22\ \text{u}$. Take $1\ \text{u} = 1.66 \times 10^{-27}\ \text{kg}$ and $e = 1.60 \times 10^{-19}\ \text{C}$. The chamber is a vacuum. Which of the following statements are correct?

Fig. 1: A mass spectrometer. At the bottom, ions from a source are sped up through 1.0 kV and go straight up through a slit S. Above the slit, dots show a uniform magnetic field of 0.20 T coming out of the page. Two half circles, not to scale, curve to the right from S and come down on a photographic plate that lies along the line through S.