A diffraction grating that has 2000 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas.

A diffraction grating that has 2000 slits per centimeter is used to measure the wavelengths emitted by hydrogen gas. (a) At what angles in the first-order spectrum would you expect to find the two violet lines that have wavelengths of 434 nm and 410 nm? (b) What are the angles if the grating has 15 000 per centimeter

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