In a microwave oven, water molecules are forced to oscillate at the frequency of

Question

In a microwave oven, water molecules are forced to oscillate at the frequency of the microwave. If assume that the water molecules are forced to execute rotation of 180 degrees in the electric field of the microwave, What is the amount of energy that each water molecule absorbs from each rotation in the microwave? Water is a permanent diploe with dipole moment 6.2 times 10^30 Cm and the average field strength of the microwave is 2000N/C. Remember that the potential energy of the dipole is given by U_dipole = -p rightarrow. E rightarrow. If you were not able to complete the worksheet in class, please go to the help session and finish it there.

Explanation / Answer

multiplied with two the fomula is E.p(1-cos(theta)) cos(180) = -1

so

the resultant becomes 2.E.p

From the formula given,

E = p.E

=6.2* 10-30 x 2000

=1.24 x 10-26 J

This is for one OH bond so resultant is 2* 1.24 * 10^-26 = 2.5 * 10^-26J

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