The pressure of earth's atmosphere at sea level is approximately 1000 millibars and decreases exponentially with elevation. At an elevation of 30,000ft, the pressure is one-third of the sea level pressure. At what elevation is the pressure half of the sea-level pressure? At what elevation is it 1% of the sea-level pressure?

Question

The pressure of earth's atmosphere at sea level is approximately 1000 millibars and decreases exponentially with elevation.  At an elevation of 30,000ft, the pressure is one-third of the sea level pressure.  At what elevation is the pressure half of the sea-level pressure?  At what elevation is it 1% of the sea-level pressure?

snowsurf · Answer

Here is a very useful equation that will help you with the problem. http://www.regentsprep.org/regents/math/algtrig/atp8b/exponentialresource.htm