How fast a person should drive his car so that the red signal of light appears green (\lambda_{\text{red }}=6200 Å, \lambda_{\text{green }}=5400 Å)

Correct Answer is : 3.9×107m∕ s

CUSAT 2021 BTech Solved Paper Shift 1

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How fast a person should drive his car so that the red signal of light appears green (λ‌red ‌=6200Å,λ‌green ‌=5400Å)

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