Reflection

Sound travels FASTEST through which of these materials?

• Air
• Empty space
• Metal
• Water

Why don't we hear an echo in rooms with lots of furniture?

• Because if sound waves meet a hard surface they are absorbed.

• Because if sound waves meet a soft surface they are absorbed.

• Because sound waves bounce back

• Because sound waves don't exist

How are echos made?

• Echos are made when sound waves are absorbed

• Echos are made when sound waves enter our ear

• Echos are made when sound waves are reflected off a surface

Which term describes when light bounces off of a smooth surface?  

• Refraction
• Transmission
• Absorption
• Reflection

........... – the angle between the normal and the incident ray.

• Angle of incidence
• Angle of reflection
• Angle of coincidence
• Angle of direction

We see shadows because light travels in a __________________ line.

• curved
• straight
• rainbow

A student placed a pencil in a cup of water.  The pencil appears broken because light-

• always travels in a straight line
• bends when it passes through water
• makes the water in the glass evaporate
• reflects the pencil on the water's surface

The illustration shows a light ray striking an object.
In the illustration, the light ray striking the object is-

• absorbed
• stopped
• reflected
• refracted

When you look into a mirror, what is happening to the light?

• It is increasing in wavelengths.

• It is being refracted.

• It is being absorbed.

• It is being reflected.

What is the angle of reflection equal to?

• The angle of refraction

• The angle of incidence

• The angle of absorption

• The angle of light