The wavelengths of two electro- magnetic waves are 3000A(degrees) and 4000A(degrees) calculate the ratio of velocities of two radiations?
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v = c / λ
v = velocity
λ= wave length
c = 3 × 10^8
v ∝ 1/λ
v1/v2 = λ2/λ1
v1/v2 = 4000A°/3000A°
v1/v2 = 4/3
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