Diffraction gratings

Questions

1 When laser light passes through a single narrow slit it forms a diffraction pattern on a screen.

Why do we not see single slit diffraction when looking through the slits of a diffraction grating?

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2 Outline one difference and one similarity between fringes made with a double slit and a grating?

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3 What property makes a 'first order' diffraction grating more like a prism than a regular diffraction grating?

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5 What could you use to make a diffraction grating for sound?

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6 Why does a crystal of salt act as a diffraction grating for x-rays?

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