The de-Broglie wavelength of an electron having 80 eV of energy is nearly ( 1eV=1.6× 10-19J, mass of electron =9.1× 10-31kg, Planck's constant =6.6× 10-34kg,s )

Question

The de-Broglie wavelength of an electron having 80 eV of energy is nearly ( 1eV=1.6× 10-19J, mass of electron =9.1× 10-31kg, Planck's constant =6.6× 10-34kg,s ) (A)  140AA  (B)  0.14AA  (C)  14AA  (D)  1.4AA

Tardigrade Admin · Accepted Answer

λ =(h/√2mE) =(6.6× 10-34/√2× 9.1× 10-31× 80× 1.6× 10-19) =1.4 AA

Q. The de-Broglie wavelength of an electron having 80 eV of energy is nearly ( $1 e V = 1.6 \times 10^{- 19} J,$ mass of electron $= 9.1 \times 10^{- 31} k g,$ Planck's constant $= 6.6 \times 10^{- 34} k g, s$ )

$140 AA$

$0.14 AA$

$14 AA$

$1.4 AA$

$λ = \frac{h}{2 m E}$ $= \frac{6.6 \times 10 ^{- 34}}{2 \times 9.1 \times 10 ^{- 31} \times 80 \times 1.6 \times 10 ^{- 19}}$ $= 1.4 \overset{˚}{A}$

Q. The de-Broglie wavelength of an electron having 80 eV of energy is nearly ( 1eV=1.6×10−19J, mass of electron =9.1×10−31kg, Planck's constant =6.6×10−34kg,s )

140AA

0.14AA

14AA

1.4AA