Question

An electron has kinetic energy 15 ev calculate the its valocity

Answer 1

$\huge\green{As-Salamu-Alykum}$

_____________

$\huge\purple{Given:-}$


Kinetic energy of electron = 15eV


Mass of electron =9.11×10^_27g


$\huge\orange{Required:-}$


Velocity of electron


$\huge\blue{Solution:-}$


Kinetic energy of electron = 15eV


1e= 1.6×10^_19


So.....


Kinetic energy of electron = 15×1.6×10^_19


Kinetic energy of electron = 24 ×10^_19J


Now.......


K.E =1/2mv^2


v^2 = 2K.E ×m


v^2= 2(24×10^_19) × 9.11×10^_27


v^2 = 437.28 ×10^_46


Taking square root on both sides


v=20.9 ×10^_46


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$\huge\blue{INSHALLAH it will help U}$