NEET Questions Solved

NEET - 2011

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) decrease by 2 times

(b) decrease by 4 times

(c) increase by 4 times

(d) increase by 2 times

We have

            λ=12.27V

So,        λ1λ2=V2V1λ2=λ1V1V2λ2=λ125100λ2=λ114=λ12

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