The velocity v of an electron = 5.817*10^6 m/s .
The kinetic energy of an electron = 154*10^19 J .
Energy is the quantitative property that is transferred to a frame or to a bodily system, recognizable in the overall performance of labor and in the shape of heat and light. strength is a conserved amount—the law of conservation of electricity states that power may be transformed in shape, but now not created. Energy is defined because of the potential to do paintings. system. The electricity stored in an object due to its function and top is referred to as capability power and is given by means of the formulation.
Velocity is the directional pace of an item in motion as an illustration of its charge of change in function as observed from a specific body of reference and as measured by way of a particular trend of time.
Wavelength given (w) = 0.1252 nm .
Mass of electron (m) = 9.1*10^-31 kg .
h (.Planck constant) = 6.626*10^-34 Js
Using formula :
w = h/mv .
V- velocity,
m - mass.
h - Planck constant .
v = h/mw
v = 6.626*10^-34 js/9.1*10^-31 kg*1.252*10^-10 m .
v = 6.626*10^-34 Js/11.39*10^-41 .
v = 6.626*10^-34 Js/1.139*10^-40 .kg m
v = 5.817*10^6 m/s .
Energy = mv^2/2
= 9.1*10^-31*(5.817*10^6)^2/2
= 308*10^19/2 = 154*10^19 J .
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