SOUNDS ENERGY

Sound is caused by

• force

• vibrations

• instruments

Which of the following is the best model to describe how a sound wave travels?

• a tree branch moving in the wind

• a car speeding down a hill

• a baseball hit by a bat

• a marble dropped in a bowl of water

Why does cupping your hands around your mouth when you shout make the sound travel further?

• The sound spreads out.

• Your voice gets louder.

• Your voice becomes muffled.

• The sound doesn't spread as much.

Research ships use sound waves to find objects underwater. What happens to the sound waves when they are emitted from the ship?

• They are absorbed by the water around the ship.

• They are reflected off objects they strike in the water.

• They are absorbed by the air above the ship.

• They are refracted as they strike the water.

How can you make a sound louder?

• move away from the sound
• use more energy to create the sound
• use less energy to make the sound
• use a smaller number of objects to create the sound

Why can't humans hear sounds made by animals such as whales?

• Humans have a great range of sounds that can be heard.

• There are ultrasounds and infrasounds beyond human hearing.

• Whales live in the water where sound is unable to be transmitted.

• Whales are too large to make any sounds.

Sound travels in the form of _____.

• waves
• loops
• straight lines
• diangles 

What can sound travel through?

• only through air
• only through water
• only through solids and liquids
• through solids, liquids, and gases

In which  medium will sound travel fastest?

• air
• water
• glass
• salt water

In which medium will sound travel slowest?

• air
• water
• glass
• salt water