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What does amplitude affect?

• the volume of the sound

• the length of a wave

• the pitch of a sound

• the speed of the sound

How does sound energy travel?

• Sound energy travels in waves that need a solid, liquid, or gas to carry them.

• Sound energy travels in waves that can move through the vacuum of empty space.

• Sound energy travels in a straight line in one direction.

• Sound energy travels in a straight line that switches directions periodically.

Select the word that means: the length of a wave from one peak ot the next

• amplitude

• wavelength

• energy

• waveform

The crest is the

• low point

• high point

• mid point

• frequency

• Crest

• Amplitude

• Wavelength

• Equilibrium

A mother dog is communicating with her puppies by making growling noises. Once the growling noise leaves the mother dog, what happens next?

• As the sound moves through the air, particles in the air collide with one another.

• As the sound moves through the air, particles in the air move back toward the mother dog.

• As sound moves through the air, particles in the air move a lot at first.

• As sound moves through the air, particles in the air line up and move toward the puppies.

What question would you ask to determine if energy has been transferred between interacting air particles?

• Did the particles get bigger?

• Did the particles come from a source?

• Did the particles change direction?

• Did the particles change direction?

Digital technology such as computers and cell phones turns voice and text messages into a

code. The code is usually made up of only two symbols, 0 and 1. The order of these symbols is used to send messages over long distances to the receiving digital device. The receiving device changes the coded message into a form people can see or hear.

Why are patterns important for digital communication?

• Patterns in the code help to keep the message secret.

• Patterns help the digital device to send electrical signals.

• Patterns create a code that the sending device and receiving device can understand.

• People who receive the messages use the code pattern to create a new code.

Select the correct meaning for energy.

• to share information

• something we observe to be similar over and over again

• the ability to make things move or change

• something scientists make to answer questions about the real world

Select the correct meaning for pattern.

• the place where something comes from

• something we observe to be similar over and over again

• the ability to make things move or change

• something scientists make to answer questions about the real world