A candle lights a darkened room, emitting a wave of amplitude A. At a distance d, the intensity is I. A second candle emits a wave of amplitude 2A. At what distance from this candle would you need to stand to measure an intensity I.

What is the temperature in degrees celsius of a substance with a tempature of 49k

You can decrease the resistance of a length of wire by

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?