In a certain crystal, there are several energy bands the lowest two of which are completely filled. Then there is a gap

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In A Certain Crystal There Are Several Energy Bands The Lowest Two Of Which Are Completely Filled Then There Is A Gap 1 (27.14 KiB) Viewed 21 times

In a certain crystal, there are several energy bands the lowest two of which are completely filled. Then there is a gap of 12 eV between the lowest energy level of the third band and the highest energy level of the two lowest bands. 27) This crystal is a. an insulator b. a semiconductor. c. a conductor. Light of wavelength 600 nm shines on a diffraction grating that has 400 lines per cm. The light emerging from the grating hits a screen 50 cm wide so that the central maximum is exactly in the middle of the screen. Assume that the screen is 3 m from the grating. 28) How many maxima appear on the screen? a. 3 b. 4 c. 5 d. 6 e. 7