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Question

The wavelength of the short radiowaves, micro waves, ultraviolet waves are λ1,λ2 and λ3 respectively. Arrange them in decreasing order.

A
λ1,λ2,λ3
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B
λ1,λ3,λ2
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C
λ3,λ2,λ1
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D
λ2,λ1,λ3
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Solution

The correct option is A λ1,λ2,λ3
We know that
1. Short radio waves
Wavelength range =1×101m to 1×104m
Frequency range =3×109Hz to 3×104Hz
2. Microwaves
Wavelength range =1×103m to 3×101m
Frequency range =3×1011Hz to 1×109Hz
3. Ultraviolet waves
Wavelength range =1×108m to 4×108m
Frequency range =3×1016Hz to 8×1014Hz
So, decreasing order is λ1,λ2,λ3.

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