18] Two beams of coherent light are shining on the same piece of white paper. Wl

Question

18] Two beams of coherent light are shining on the same piece of white paper. Wlth respect wll troughs of such waves, darkness will occur on the paper where: a. the crest from one wave overlaps with the crest from the other. b. the crest from one wave overlaps with the trough from the other. c. the troughs from both waves overlap. d. darkness cannot occur as the two waves are coherent. 191 When a glass rod is rubbed with silk, which of the following statements best describes what happens? a. b. c. d. Electrons are removed from the rod. Protons are removed from the silk. The silk is charged positively. The silk remains neutral whot will he the nature of the

Explanation / Answer

question 8.

darkness means destructive inteference.

which occurs when Crest of one wave overlaps with trough of another.

Answer -b

question no. 9

on rubbing , rod looses electrons which are gained by silk

so

answer -a

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