The speed of an electron having a wavelength of 10⁻¹⁰ m is

The speed of an electron having a wavelength of 10⁻¹⁰ m is

(a) 6.26×10⁶ m/s
(b) 5.25 x10⁶ m/s
(c) 7.25×10⁶ m/s
(d) 4.24×10⁶ m/s

7.25×10⁶ m/s

λ = h / momentum = h / mv

v = h / mλ = 6.6 × 10⁻³⁴ / (9 × 10⁻³¹) × 10⁻¹°

v = 7.25 × 10⁶ ms⁻¹

admin:

Parth says:

May 2, 2018 at 11:21 am

P=h/lamba.....1equ
P= momentum
H=Planck's constant
Lamba= wavelength
And
P=MV.....2 equ
M= mass
V= speed
Put 2 in 1
MV=h/lamba
9.1x10^-31*v=6.6x10^-34/10^-10
By solving u get the value of v
V=0.725*10^7=7.25*10^6