Question
(a) What is the final speed of an electron accelerated from rest through a voltage of 25.0 MV by a negatively charged Van de Graaff terminal? (b) What is unreasonable about this result? (c) Which assumptions are responsible?
1. $2.96 \times 10^9 \textrm{ m/s}$
2. The speed exceeds that of light, which is impossible.
3. The false assumption is that the final speed would be non-relativistic. Equations that take relativity into account must be used.
Solution Video