16.The process the air undergoes as it descends is approximately (A) isothermal (B) isobaric (C) adiabatic (D) constant-volume (E) free expansion.

10. An electric dipole consists of two opposite charges, each with mass m and charge ±q (respectively), and the two charges are separated by a distance d. Under a uniform external electric field E, the electric dipole performs simple harmonic oscillation if the angle between the dipole and E is small. The period of this oscillation is (A) (B) (C) (D)(E) none of the above.

16.The process the air undergoes as it descends is approximately
(A) isothermal
(B) isobaric
(C) adiabatic
(D) constant-volume
(E) free expansion.

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