Which of the following, is the longest wave ?

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Which of the following, is the longest wave ?

1. X-rays
2. γ-rays
3. microwaves
4. radio waves

Correct Option: D

Rays	Wavelength [Range in m]
X-rays	1 × 10^–11 to 3 × 10^–8
γ-rays	6 × 10^–14 to 1 × 10^–11
Microwaves	10^–3 to 0.3
Radiowaves	10 to 10⁴