Question

(1) Which pattern, single-slit or double-slit, gives a more accurate determination of wavelength or do they both give equally accurate values? Defend your answer.

(2) From you superimposed single and double slit patterns, what can you conclude about the influences of the slit width, and the slit separation, or the double slit pattern?

Answer 1

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Answer of 1)

Double slit experiment gives more accurate result. This fact is observed from the diffraction grating experiment done in tha laboratory

Answer of 2)

The double-slit experiment, sometimes called Young's experiment (after Young's interference experiment), is a demonstration that matter and energy can display characteristics of both waves and particles, and demonstrates the fundamentally probabilistic nature of quantum mechanical phenomena.

The pattern formed by the interference and diffraction of coherent light is distinctly different for a single and double slit. The single slit intensity envelope is shown by the dashed line and that of the double slit for a particular wavelength and slit width is shown by the solid line. The photographs of the single and double slit patterns produced by a helium-neon laser show the qualitative differences between the patterns produced. You can see that the drawing is not to the same scale as the photographs, but the breaking up of the broad maxima of the single slit pattern into more closely spaced maxima is evident. The number of bright maxima within the central maximum of the single-slit pattern is influenced by the width of the slit and the separation of the double slits.