13.5 joule is the kinetic energy of the ejected electron
K.E= mc²/2λ²
m=9.1×10⁻³¹
c=3×10^8 m/s
λ=5.5 ×10^-8 m
K.E=8.1×10^-14/6.05 ×10^-15
K.E= 13.5 joule
Kinetic energy is a specific kind of power that can be present in moving objects or particles. An item gains kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. Kinetic energy is a characteristic of motion that depends on the mass and speed of an object or particle. Motion includes all combinations of vibration, axis rotation, translation, and movement (along a path from one location to another). A body's translational kinetic energy, which is determined by multiplying its mass, m, by the square of its speed, v, is equal to 1/2mv^2.
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