A proton of mass enters a device with speed

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A proton of mass

1.67\times10^{-27}\,\text{kg}

enters a device with speed

1.0\times10^{5}\,\text{m\,s}^{-1}

. It moves through a region where the electric potential decreases by

1.8\,\text{kV}

and then immediately through a second region where the potential increases by

0.50\,\text{kV}

. Calculate the proton’s speed after emerging from the second region.