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The wavelengths of the four visible lines in the Balmer series of light emitted by a...

  1. The wavelengths of the four visible lines in the Balmer series of light emitted by a hydrogen gas-discharge lamp are equal to 656.279 nm, 486.135 nm, 434.0472 nm and 410.1734 nm. A diffraction grating of width 1 cm has 2000 lines. It is used to measure the four visible wavelengths. (a) Determine the first-order diffraction angles of these four lines. (b) What is the angular width of each one of the four lines. (c) How many orders could be observed for the violet line having wavelength 410.1734 nm?

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