Atomic StructureHard
Question
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100 kV then the de-Broglie wavelength associated with the electrons would
Options
A.increase by 2 times
B.decrease by 2 times
C.decrease by 4 times
D.increase by 4 times
Solution
The de broglie wavelength λ associated with electrons is
where V is the accelerating potential in volts
or
∴
where V is the accelerating potential in volts
or
∴
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