What is the de Broglie length of an electron,which is accelerated from the rest,through a potential difference of 100v?

What is the de Broglie length of an electron,which is accelerated from

1.	What is the de Broglie length of an electron,which is accelerated from the rest,through a potential difference of 100v?
Answer» Solution :Potential difference =b=100v Potential energy=eV=`1.609xx10^(-19)cxx100` `1/2mv^(2)=1.609xx10^(-19)XX100` `1/2mv^(2)=1.609xx10^(17)J` `v^(2)=(2xx1.609xx10^(-10))/(m)` m=mass of elctron`=9.1xx10^(-31)KG` `:.v^(2)=(2xx1.609xx10^(17))/(9.1xx10^(-31))` `:.v=SQRT(2xx1.609xx10^(-17))/(9.1xx10^(31))`=`sqrt(2xx1.609xx10^(-17)xx10^(31)/(9.1)` `v=sqrt(3.218xx10^(14)/(9.1)` `v=5.93xx10^(6)m/s` `gamma=h/(MV) Where h=6.62xx10^(-34)JS` `=(6.62xx10^(-34))/(9.1xx10^(-31)xx5.93xx10^(6))` `1.2xx10^(-10)m` `gamma=1.2A`