STANDARDPhysics-Modern Physics
STANDARD Physics de-Broglie Wavelength MCQ Question
Type: MCQ-conceptual-Medium
If the kinetic energy of an electron is increased four times, the wavelength of the de-Broglie wave associated with it would become
A
one fourth
B
half
C
four times
D
two times
Correct Answer
Option B
Detailed Explanation
The de-Broglie wavelength λ is given by λ = h/mv. If kinetic energy (K.E.) is increased four times, velocity v becomes twice (since K.E. = 1/2 mv²). Therefore, λ becomes half.
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