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Electrons with de-Broglie wavelength $$\lambda$$ fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-rays is

A
$$\lambda_{0}=\frac{2 m c \lambda^{2}}{h}$$
B
$$\lambda_{0}=\frac{2 h}{m c}$$
C
$$\lambda_{0}=\frac{2 m^{2} c^{2} \lambda^{3}}{h^{2}}$$
D
$$\lambda_{0}=\lambda$$
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