AIPMT PRELIMS2011Physics-Modern Physics
AIPMT PRELIMS 2011 Physics Wave-Particle Duality MCQ Question
Type: MCQ-conceptual-Medium-Class 12
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
A
Increase by 4 times
B
Increase by 2 times
C
Decrease by 2 times
D
Decrease by 4 times
Correct Answer
Option C
Detailed Explanation
The de-Broglie wavelength λ is inversely proportional to the square root of the accelerating voltage (λ ∝ 1/√V). Increasing the voltage by 4 times decreases the wavelength by 2 times.
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