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Air enters in the lungs in a tiny cavity...

Air enters in the lungs in a tiny cavity called alveoli. Oxygen diffuses into our blood from alveoli. The average radius of alveoli is 0.005 cm and air inside it contains 21% `O_(2)` and 79% `N_(2)`. Assuming that the pressure in the aveoli is 1 atm at body temperature of `37^(@)C`.
Number of `N_(2)` molecules in one alveoli is :

A

`9.8 xx 10^(13)`

B

`9.8 xx 10^(12)`

C

`9.8 xx 10^(14)`

D

`9.8 xx 10^(15)`

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The correct Answer is:
B
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Air enters in the lungs in a tiny cavity called alveoli. Oxygen diffuses into our blood from alveoli. The average radius of alveoli is 0.005 cm and air inside it contains 21% O_(2) and 79% N_(2) . Assuming that the pressure in the aveoli is 1 atm at body temperature of 37^(@)C . Volume of single alveoli is :

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