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Question: a person was arrested for going over the railway level...

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A person was arrested for going over the railway level crossing on a motor cycle when the lights were red. When he was produced before the magistrate the physicist declared that he was not guilty as red lights (λ = 670 nm) appeared green (λ = 525 nm) due to Doppler effect. At what speed he was travelling for the explanation to be valid? Do you think that such a speed is feasible?

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