Question

An electron is moving with velocity 1.2 x 106 m/s. If mass of electron is 9.1 x 102-31 kg then find its kinetic energy.

Answer 1

Answer:

6.552 x 10-19

Explanation:

by applying 1/2 mv2 we have this. Try it

Answer 2

Answer:

Calculating the Kinetic Energy of the Moving electron

Explanation:

Now let us get to the formula that is used for calculating the KE of the electron.

KE is calculated using the formula as below:-

KE = ½ mv2

Here , KE stands for the Kinetic Energy , M stands for the mass, V stands for the Velocity.

As per the question, we have Mass (m) = 9.1 x 10^-31 Kg. ( it cannot be 9.1 x 102^-31, I assume).

Velocity (v) = 1.2 x10^6 m/s.

So by using this in the equation for KE we get

KE = ½ mv^2

KE = ½ X 9.1 X 10^-31 X (1.2 x 10 ^ 6)^2

KE = ½ X 9.1 X 1.2 X 1.2 X 10^6 X 10 ^6 X 10^-31

KE = ½ X 9.1 X 1.2 X 1.2 X 10 ^(6+6-31)

KE = ½ X 13.10 X 10 ^ -19

KE = 11.10 X 10 -19 m/sec.