Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (jus

Question

Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d= 0.353 nm and X-rays of wavelength -0.093 4 nm are used, what is the smallest angle at which a diffraction maximum may be obtained? a. 9.92 b. 7.60 C. 13.3° d. 15.5° e. 6.52° 24. ANS: B PTS: 2 DIF: Average What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume = 500 nm light and a pupil diameter D 0.50 cm. Assume eye fluid has an average n = 1.33 a. 150 m b. 100 m c. 250 m d. 25 m e. 18 m 25. ANS: E PTS: 2 DIF: Average 26, Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity? a. 3 polarizing filters, each rotate beam by 30° b. 2 polarizing filters, both rotate beam by 45° c. 1 polarizing filter, rotating beam by 90 d. None of the above, polarized light can't be rotated.

Explanation / Answer

As I see from the image, it seem that you already solved 24 and 25 question because it ans are already there.

So I am going to attempt question number 26.

The maximum intensity of beam will be obtain only when one filter rotate the beam to 90°. Its intensity should be half of the original in case if we use more filter then intensity will reduce further.

Hence the answer is c.

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