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Question

The wavelength of the short radiowaves, micro waves, ultraviolet waves are $${ \lambda  }_{ 1 }, { \lambda  }_{ 2 }$$ and $${ \lambda  }_{ 3 }$$ 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 $${ \lambda }_{ 1 },{ \lambda }_{ 2 },{ \lambda }_{ 3 }$$
We know that
1. Short radio waves
    Wavelength range $$=1\times { 10 }^{ -1 } m$$ to $$1\times { 10 }^{ 4 } m$$
    Frequency range $$=3\times { 10 }^{ 9 }Hz$$ to $$3\times { 10 }^{ 4 }Hz$$
2. Microwaves
    Wavelength range $$=1\times { 10 }^{ -3 } m$$ to $$3\times { 10 }^{ -1 } m$$
   Frequency range $$=3\times { 10 }^{ 11 }Hz$$ to $$1\times { 10 }^{ 9 }Hz$$
3. Ultraviolet waves
     Wavelength range $$=1\times { 10 }^{ -8 } m$$ to $$4\times { 10 }^{ -8 } m$$
     Frequency range $$=3\times { 10 }^{ 16 }Hz$$ to $$8\times { 10 }^{ 14 }Hz$$
So, decreasing order is $${ \lambda  }_{ 1 },{ \lambda  }_{ 2 },{ \lambda  }_{ 3 }$$.

Chemistry

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