What the frequency of the photon emitted when an electron goes from the 4th energy level (E4 = -0.85eV) to the 3rd energy level (E3 = -1.51eV)
a. 1.59x1014hz
b. 2.05 x1014hz
c. 3.65 x1014hz
d. 5.70 x1014hz

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Debris produced by mining is called

Matter that emits no light at any wavelength is called

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?