Atomic Structure

JEE Main 2015 Questions › Physical Chemistry questions › Atomic Structure

An electron, a proton and an alpha particle have kinetic energies of 16E,4E and E respectively. What is the qualitative order of their de Broglie wavelengths ?
a)I_e>I_p=I_a
b)I_p=I_a>I_e
c)I_p>I_e>I_a
d)I_a<I_e>>I_p

#Chemistry #Physical Chemistry

UP 0 DOWN 0 0 2
Post on FacebookPost anonymously?

2 Answers

996

Swarna Kamal Dhyawala ·2013-06-18 10:15:06

Î» is proportional to 1/âˆš(Km)
For the electron m = 1/2000 amu approx and K =16E.
1/âˆš(Km) = 1/âˆš(16E x (1/2000)) = 11.2/âˆšE approx

For the proton m = 1 amu approx and K =16E.
1/âˆš(Km) = 1/âˆš(16E x 1) = 0.25/âˆšE

For the alpha particle m = 4 amu approx and K =4E
1/âˆš(Km) = 1/âˆš(4E x 4) = 0.25/âˆšE

UP 1 DOWN 1
Raunaq Saha Thanks a lot :D
Upvote·0· Reply ·2013-06-19 05:42:04
Post on FacebookPost anonymously?

996

Swarna Kamal Dhyawala ·2013-06-17 10:12:41

Î» = h / âˆš2mK.E
i.e Ie>Ip=Ia
(A)should be the answer

UP 0 DOWN 1
Raunaq Saha but why is Ip=Ia ?
Upvote·0· Reply ·2013-06-18 06:12:21
Post on FacebookPost anonymously?

Your Answer

Basic Integral Calculus Operators Symbols Matrix Cases

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω

Close [X]

Atomic Structure

2 Answers

Your Answer

Add Image

Similar Questions