Light & Sound Study Guide

Which object should Lexi place in front of her flashlight to signal "Hello" to her classmates?

• A. cardboard
• B. wax paper
• C. clear plastic
• D. glass prism

Hudson needs to lower the pitch of the guitar to play his songs. How can he lower the pitch of the guitar?

• make the strings

  tighter so they

  vibrate faster

• make the strings

  looser so they

  vibrate faster

• make the strings

  tighter so they

  vibrate slower

• make the strings

  looser so they

  vibrate slower

Savannah is clapping her hands at a concert.

If she uses more force to clap her hands, the sound will most likely become

• louder in volume
• softer in volume
• higher in pitch
• lower in pitch

When Parker turns on the flashlight, which path is the light most likely to travel?

(the circles are holes in the cardboard)

• 
• 
• 
• 

Which object best reflects light?

• a sheet of paper
• a box of crayons
• a hand lense
• a mirror

What does it mean if an object is transparent?

• It is see-through
• It is very strong.
• It is very lightweight.
• It is long-lasting.

Brooks held a smooth piece of aluminum foil near his face and could see himself.

Then, he crumpled up the foil, opened it back up, and looked at the foil again.

He could not see himself this time.

Why was Brooks unable to see himself in the crumpled piece of foil?

• A. The foil lost its thickness, and light was able to travel through it.
• B. The foil was uneven and trapped all of the light that traveled toward it.
• C. The foil was uneven, and the light that hit it traveled in many different directions.
• D. The foil absorbed the oils in Joshua's hand, and the oil caused light to stop at the foil.

Light travels in waves. Which of the following statements about light waves is NOT true?

• A. They can travel through any type of material.
• They can be reflected by some types of material.
• They can come from sources across space.

Which of these sounds has a high pitch?

• a whistle
• whales
• a truck
• thunder

Which of the following is required for sound?

• chemicals

• vibrations

• water

• instruments