03/05/25

What causes the refraction of a wave?

• The density of the medium changes speed.

• The wave travels in a straight line.
• The amplitude of the wave changes.
• The frequency of the wave increases.

Light travels faster in ______ material.

• more dense

• less dense

• lower

• higher

A child wants to look around an 80* corner.  What angle

would they set a mirror at to see around the corner

• 30°
• 70°
• 50°
• 40°

Movie theaters are very large and the sound will echo in the room.  What special material is on the walls to help with sound.  What are the characteristics of the wall that will help the sound not echo throughout the theater?

• Metal sheets; smooth and rigid texture.
• Soft materials that absorb, and are less dense.

• Wooden panels; hard and reflective surface.
• Concrete walls; dense and heavy material.

What is the difference between diffraction and refraction?

• Diffraction and refraction both involve the same process of wave interference.
• Diffraction involves bending of waves, whereas refraction involves change of direction due to medium change.
• Diffraction is the reflection of waves, and refraction is the absorption of waves.
• Diffraction occurs only with sound waves, while refraction occurs with light waves.

A electromagnetic wave can be used for ___.

• light display
• data storage
• power generation
• communication, medical imaging, heating

Mechanical waves are used to ____.

• transmit energy
• reflect light
• measure temperature
• create sound