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Asked in JEE Main 5th Sept 2nd Shift 2020 · Ranges, production and detection
Microwave is 0.1 m to 1 mm, so 10⁻³ m = 1 mm → (iv)
Gamma is < 10⁻³ nm = < 10⁻¹² m, so 10⁻¹⁵ m → (ii); X-rays are 1 nm to 10⁻³ nm, and 10⁻¹⁰ m = 0.1 nm → (iii)
A.M. radio is 530 kHz to 1710 kHz, giving λ = c/ u ≈ (3 × 10⁸)/(10⁶) ≈ 300 m, the 100 m entry → (i)
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