00:01
For this question, we're given an electron with kinetic energy of 7 terah electron volts.
00:12
Now this is equals to 7 times 10 power of 6 mega electron volts and it is actually much much higher than the rest energy of an electron.
00:29
So mc square, if you take to mass of an electron, we should get about 0 .511m .m .m .v.
00:40
And so you can see the magnitude, although magnitude is about seven times higher.
00:47
Now, if you were to compare the total energy of the electron, square, plus, s .4, so this part is the rest energy part, whereas this part is the momentum and the kinetic energy part.
01:06
Right and since we are given that kinetic energy is much larger than our rest energy we can assume that our energy total energy is approximately just p square c square right so e is approximately p c right and now we can find out what is our de progly's wavelength wavelength is defined as h over p, which is the momentum.
01:43
Now h is our planx constant.
01:46
And so substituting that into this equation, right, for our p...