Suppose That a Bubble of Helium (A Monatomic Gas) Rising $3.5 \mathrm{~atm}$

Multiple Choice

Suppose that a bubble of helium (a monatomic gas) rising from the bottom of the ocean expands in volume by a factor of 8 by the time it reaches the surface [where the pressure is 1 atmosphere (atm) ]. Assume that the bubble rises so fast that it expands essentially adiabatically. What was the pressure on the gas at the depth where it formed (in atmospheres) ?

A) $3.5 \mathrm{~atm}$
B) $8 \mathrm{~atm}$
C) $16 \mathrm{~atm}$
D) $18 \mathrm{~atm}$
E) 32 atm
F) Other (specify)