The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is

⇦

⇨

The wavelength of Kα line in copper is 1.5Å. The ionisation energy of K electron in copper is

Options

(a) 11.2×10⁻¹⁷ J
(b) 12.9×10⁻¹⁶ J
(c) 1.7×10⁻¹⁵ J
(d) 10×10⁻¹⁶ J

Correct Answer:

12.9×10⁻¹⁶ J

Explanation:

Required ionization energy, E = hc / λ

E = 6.6 × 10⁻³⁴ × 3 × 10⁸ / 1.5 × 10⁻¹°

= 12.9 × 10⁻¹⁶ J

Related Questions:

1. The unit of permitivity of free space, ε₀ is
2. Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
3. A particle of mass m executes simple harmonic motion with amplitude
4. During negative β-decay
5. Alternating current cannot be measured by D.C Ammeter because

Topics: Atoms and Nuclei (136)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends