00:01
Sub part a the acceleration experienced by the electron is given by the electric force acting on the electron divided by the mass of the electron and the electric force can be written as the product of the charge of the electron and the electric field divided by m now substituting the values we get minus one point six into the power of minus nineteen columns multiplied by the electric field which is 47 newton per column, the whole divided by the mass of the electron which is 9 .1 into 10 to the power of minus 3 kilogram.
00:46
Now on calculating we get minus 8 .2637 into 10 to the power of 12 meter per second square.
00:57
Now, the final speed of the electron is given by the expression u plus 80.
01:06
Here, u is the initial speed which is given to be 40 km per second, which can also be written as 40 into 10 to the power of 3 meter per second.
01:18
And the time travel is given to be 1 .2 nanoseconds, which can be written as 1 .2 into 10 to the power of minus 9 seconds.
01:30
Now on substituting the values in the expression for we get 40 into 10 to the power of 3 meter per second plus minus 8 .2637 into 10 to the power of 12 meter per second square multiplied by 1 .2 into 10 to the power of minus 9 seconds.
01:54
On calculating we get 3.
01:57
0 .0083 into 10 to the power of 4 meter per second...