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Which of the following electromagnetic radiations has the longest wavelength?

Asked in NEET 1989 · Order of the bands

Answer: (4) Radiowaves

Step-by-step solution

Compare the four by their usual ranges.

Gamma rays: about 10⁻¹⁴ to 10⁻¹¹ m. X-rays: about 10⁻¹¹ to 3×10⁻⁸ m.

Microwaves: about 10⁻³ to 0.3 m. Radio waves: about 10 m to 10⁴ m.

Radio waves are the longest by a wide margin.

Why the other options are wrong

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