What is buoyancy? On what factors do it depend?

What is mean free path of a gas molecule? On What factors does it depend?

What is electron gain enthalpy? On what factors does it depend?

What is meant by electronegativity? On what factors does it depend?

If a straight conductor moves in a magnetic field, what will be the expression for emf induced in that conductor? On what factors does this emf depend?

What is power of a lens? On which factor its depends? What it its unit?

What is factor?

When an aeroplane flies horizontally, a potential difference is developed across the two ends of its wings. Why? On what factors does this potential difference depend?

What is Q-factor?

Define refractive index. On which factors it depends on?

On what factors does the buoyant force depend?