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Asked in GUJCET 2014 · Order of the bands
Idea: wavelength falls steadily as you move along the spectrum from radio through microwave and infrared to visible and ultraviolet.
Short radio waves are metres to tens of metres, microwaves run from millimetres to about 30 cm, ultraviolet is a few hundred nanometres and below.
So λ₁ > λ₂ > λ₃.
In decreasing order that is λ₁, λ₂, λ₃.
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