Understanding Transparency and Atomic Structure

What is the main reason that objects like bricks or steel are not transparent to visible light?

• They are too thick for light to pass through.

• Their atoms absorb visible light.

• They reflect all light.

• They are made of dense materials.

Why is glass transparent to visible light?

• It reflects visible light.

• It has no atoms.

• Visible light doesn't have enough energy to move its electrons to a higher level.

• Its atoms are perfectly aligned.

Why is it difficult to get a sunburn through a window?

• Glass absorbs UV light, which causes sunburn.

• Windows are coated with sunscreen.

• Visible light is too weak to cause sunburn.

• Windows block all types of light.

What determines how transparent a material is to light?

• The energy relationship between light and the material's electrons.

• The temperature of the material.

• The thickness of the material.

• The color of the material.

Why are humans not transparent to visible light?

• Our bodies are too large.

• Our skin reflects all light.

• Our atoms absorb visible light.

• We are made of dense materials.

What causes the sensation of touch when you press against an object?

• The object's surface temperature.

• Electrostatic repulsion between electron clouds.

• The object's atoms merge with your skin.

• The density of the object.

What prevents atoms in your body from passing through the atoms in the ground?

• The weight of the body.

• Magnetic fields.

• Electrostatic repulsion between electron clouds.

• Gravitational forces.

How can two negatively charged electrons occupy the same energy level?

• By having the same spin.

• By having opposite spins.

• By being in different atoms.

• By being in a vacuum.

What is the significance of covalent bonds in materials?

• They make materials transparent.

• They hold atoms together in molecules.

• They allow materials to conduct electricity.

• They make materials magnetic.

What allows visible light to pass through the glass of a camera lens?

• The glass is very thin.

• The glass is coated with a special film.

• The energy levels of the glass atoms are too far apart for visible light to affect.

• The glass is heated to a high temperature.