Question

If the momentum of an electron is changed by P, then the de Broglie wavelength associated with it changes by $0.5 \%.$ The initial momentum of electron will be

• A. 200P
• B. 400P
• C. $\frac {P}{200}$
• D. 100P

Answer 1

Answer: (A)

200P

Answer 2

de Broglie wavelength associated with an electron is
$?= \frac {h}{P} \, or \, P= \frac {h}{?}$
$\therefore \frac {?P}{P}=- \frac {??}{?}$
$\frac {P}{P_{initial}}= \frac {0.5}{100}$
$P_{initial}=200 P$