Question

A certain moving electron has a kinetic energy of 1.01 × 10−19 J. Calculate the speed necessary for the electron to have this energy. The mass of an electron is 9.109 × 10−31 kg. Answer in units of m/s.

Answer 1

Answer:

Velocity of electron will be equal to $v=4.711\times 10^5m/sec$

Explanation:

We have given kinetic energy of electron $KE=1.01\times 10^{-19}J$

Mass of electron $m=9.1\times 10^{-31}kg$

We have to find velocity of electron

Kinetic energy of electron is equal to $KE=\frac{1}{2}mv^2$, here m is mass and v is velocity

So $1.01\times 10^{-19}=\frac{1}{2}\times 9.1\times 10^{-31}\times v^2$

$v=4.711\times 10^5m/sec$

So velocity of electron will be equal to $v=4.711\times 10^5m/sec$