Question

Wavelength of an electron having energy 10 keV is ________ A°.(A) 0.12
(B) 1.2
(C) 12
(D) 120

Answer 1

0.12 because more energy less qavelength

Answer 2

Dear Student,

◆ Answer - (B)

λ = 1.2 A°

● Explanation -

# Given -

E = 10 keV = 10×10^3×1.6×10^-19 J

# Solution -

Energy of electron is given by formula -

E = hc/λ

λ = hc/E

λ = (6.63×10^-34 × 3×10^8) / (10^4 × 1.6×10^-19)

λ = 1.2×10^-10

λ = 1.2 A°

Therefore, wavelength of given electron will be 1.2 A°.

Thanks dear...