Electron beam used in an electron microscope, when accelerated by a voltage of 20 kV, has a de-Broglie wavelen…

Question

Electron beam used in an electron microscope, when accelerated by a voltage of $20 \, \text{kV}$ , has a de-Broglie wavelength of $\lambda_0$ . If the voltage is increased to $40 \, \text{kV}$ , then the de-Broglie wavelength associated with the electron beam would be:

A
$3\lambda_0$
B
$9\lambda_0$
C
$\frac{\lambda_0}{2}$
D
$\frac{\lambda_0}{\sqrt{2}}$

Accepted Answer

D. $$\frac{\lambda_0}{\sqrt{2}}$$

Answer

A. $$3\lambda_0$$

Answer

B. $$9\lambda_0$$

Answer

C. $$\frac{\lambda_0}{2}$$

Answer & step-by-step solution

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