An Air Bubble Is 50 Cm Below the Surface of a Lake

question 37

Multiple Choice

An air bubble is 50 cm below the surface of a lake. In that case, we assume that the bubble has only one surface to generate surface tension. The gauge pressure inside the bubble is 6.0 × 10³ Pa. What is radius of the bubble? (The density of the water is ñ_H2O = 1000 kg/m³, and the surface tension is ó = 0.073 N/m.)

• A)2.6 × 10^-4 m
• B)1.3 × 10^-4 m
• C)6.0 × 10^-7 m
• D)3.0 × 10^-7 m

---

Definitions:

Nucleosomes

Nucleosomes are the basic structural unit of DNA packaging in eukaryotic cells, composed of a segment of DNA wound around a core of histone proteins.

Histones

Small, positively charged (basic) proteins in the cell nucleus that bind to the negatively charged DNA. See nucleosomes.

Somatic Cell

In animals, a cell of the body not involved in formation of gametes. Compare with germ line cell.

Interphase

The stage of the cell cycle between successive mitotic divisions; its subdivisions are the G-22 / Glossary phases.