00:01
In part a of this question, we have been given that an electron with a wavelength 85 angstrom.
00:16
All right.
00:17
So the wavelength of the electron is given.
00:20
So in first part, we have to find the momentum of the electron.
00:28
Momentum of the electron is given by the formula, planks constant divided by wavelength.
00:37
All right now planks constant the value of the plank's constant is 6 .62 multiplied by 10 raised to the power minus 34 divided by valent is given that is 85 angstrom 85 multiply angstrom is 10 raised to the power minus 10 meters so from here the momentum of the electron comes out to be 7 .7 .78 multiplied by 10 raise to the power minus 26 kg's meters per second.
01:23
In part two we have to find the velocity or the speed of the electron.
01:30
The speed of the electron is given by momentum divided by mass.
01:37
Let's plug in the values.
01:39
Momentum has already been calculated that is 7 .7 -78 multiplied by 10 raised to the power minus 26 kgues meters per second divided by we know that mass of the electron is equal to 9 .11 multiplied by 10 raised to the power minus 31 kgis kilograms so from here the speed with which the electron is moving comes out to be 8 .85 so 8 .85 so 8 .5 note 8 .5 .8 .5 multiplied by 10 raised to the power 4 meters per second.
02:28
So this is the speed with which the electron is moving.
02:32
Now in the third part of first part, we have been asked to find the energy of the electron.
02:41
Energy of the electron is given by the formula half times mass times the scale of the velocity.
02:49
So let's plug in the values half...