30.A wave source moves away from your position, describe the shift in wavelength and frequency you
will perceive.

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when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.