Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will be

Options:

7840 Å

5362 Å

7219 Å

6563 Å

Correct Answer:

6563 Å

Explanation:

The correct answer is Option (4) → 6563 Å

Using Rydberg formula,

$\frac{1}{λ}=R_H\left(\frac{1}{{n_i}^2}-\frac{1}{{n_f}^2}\right)$

$⇒\frac{1}{λ}=1.097×10^7\left(\frac{1}{2^2}-\frac{1}{3^2}\right)$

$⇒λ=6563 Å$