What is the ratio of velocities of light of wavelenght 4000,a and 8000a in vaccum?
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lamda1 is 4000 anstrom and lambda2 is 8000 anstrome
therefore lamda1÷lamda2=velocity1÷velocity2
4000a ÷8000a=1:2
therefore lamda1÷lamda2=velocity1÷velocity2
4000a ÷8000a=1:2
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