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NEET 2011 (AIPMT, Prelims) · Matter Waves: de Broglie Wavelength

Matter Waves: de Broglie Wavelength question from NEET 2011 (AIPMT, Prelims)

Q144NEET 2011 · AIPMT · PRELIMSEasy

Matter Waves: de Broglie Wavelength

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

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Answer: (b)

$\lambda \propto \dfrac{1}{\sqrt{V}}$ .
$\dfrac{\lambda'}{\lambda} = \sqrt{\dfrac{25}{100}} = \dfrac{1}{2}$ .
So the answer is (b) decrease by 2 times.

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