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Q. A molecule is shown schematically. The distance from the center of the larger atom to the center of the smaller atom is d = 0.96, and the angle between the smaller atoms is θ = 105.6°. Find out the center-to-center distance between the smaller atoms. (1 = 10-10 m.)

Q. A particular guitar string is supposed to vibrate at 207 Hz, but it is measured to in fact vibrate at 212 Hz. By what percentage have to the tension in the string be changed to get the frequency to the correct value?

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