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
B
λ1,λ3,λ2
C
λ3,λ2,λ1
D
λ2,λ1,λ3

Solution

## The correct option is A $${ \lambda }_{ 1 },{ \lambda }_{ 2 },{ \lambda }_{ 3 }$$We know that1. 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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