Solve this: Q7 Find the retarding potential required to stop electron of the de Broglie wavelength 0 5 - Physics - Dual Nature Of Radiation And Matter

Question

Solve this:

Q7 Find the retarding potential required to stop electron of the de
Broglie wavelength 0 5 nm

Hint : eV s   = hc λ

Aarushi Mishra · Accepted Answer

De brogle wavelength, λ=hpWe knowp=2mK, where K is kinetic energyλ=h2mKBy energy conservationTotal initial enrgy=Total final energyTotal initial energy=K assuming potential to be zeroAs the electron moves through stopping potential region it will gain potential energy charge × potential difference=eVS and its velocity will become 0Total final energy =eVSK=eVSλ=h2meVSVS=hλ2meVS=h2λ2×2mePutting all valuesλ=0
5nm=5×10-10mm=9 11×10-31e=1 602×10-19h=6
626×10-34VS=6
02 VoltYou cannot use the formula given in hint eVS=hcλAs formula for energy, E=hcλ is valid only for photon and not for electron
 Given formula is wrong

Solve this: Q7. Find the retarding potential required to stop electron of the de Broglie wavelength 0.5 nm. Hint : eV s = hc λ

Solve this:

Q7. Find the retarding potential required to stop electron of the de Broglie wavelength 0.5 nm.

Hint : ${eV}_{s} = \frac{hc}{λ}$