The mass of an electron is 9.1x10 -31 kg.If its kinetic energy is 3.0x10 -25 J.CALCULATE ITS WAVELENGTH........
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The wavelength will be calculated from the De Brogile's relation which is
^=h/(m×v)
Where ^ is the wavelength,h is the planck's constant,m is the mass of the electron &v is its velocity.For calculating velocity we will use the expression
E=1/2m/v²
We are given that e=3×10^-25J.Therefore we get
v=8.12×10²
Hence ^=h/(m×v)
=6.63×10^-34(9.1×10^-31×8.12×10^2
=8.972×10^-7m
Hence wavelength of the electron will be 8.972×10^-7m
^=h/(m×v)
Where ^ is the wavelength,h is the planck's constant,m is the mass of the electron &v is its velocity.For calculating velocity we will use the expression
E=1/2m/v²
We are given that e=3×10^-25J.Therefore we get
v=8.12×10²
Hence ^=h/(m×v)
=6.63×10^-34(9.1×10^-31×8.12×10^2
=8.972×10^-7m
Hence wavelength of the electron will be 8.972×10^-7m
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