A source containing a mixture of hydrogen and deuterium atoms emits light at two wavelengths whose mean is 641 nm and whose separation is 0.211 nm. Find the minimum number of lines needed in a diffraction grating that can resolve these lines in the first order.
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![A source containing a mixture of hydrogen and deuterium atoms emits light at two wavelengths whose mean is 641 nm and whose
separation is 0.211 nm. Find the minimum number of lines needed in a diffraction grating that can resolve these lines in the first order.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc1f0aebc-fbdc-4356-9367-76628cca066f%2F78e4081d-ee6a-4095-bf5d-9bd288a78e3f%2F1ajh8qq_processed.png&w=3840&q=75)
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