The wavelength of `K_alpha` and `L_alpha` X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of `K_beta` X-ray of the material.

Explanation

To find the wavelength of the `K_beta` X-ray of a material given the wavelengths of `K_alpha` and `L_alpha` X-rays, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Values:**
- Wavelength of `K_alpha (λ1) = 21.3 pm`
- Wavelength of `L_alpha (λ2) = 141 pm`

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