2) Which part of the diagram below shows the wavelength?

• a

• b

• c

• d

3) Which is the best description of how sound waves travel?

• in a straight path to your ear

• back and forth from the source

• outward in all directions

• upward from the source

4) A student hypothesizes that sound travels faster through glass than through plastic or wood. He performs an experiment and gathers his data. The following graph shows his data.

• Wood is better than plastic or glass.

• Glass is better than plastic or wood.

• Sound travels fastest through wood.

• Sound travels fastest through plastic.

5) An echo is heard when sound waves are _____.

• changed by the Doppler effect

• absorbed by a material

• moving through empty space

• reflected from a surface

6) Which measure identifies the pitch of a sound?

• amplitude

• frequency

• wavelength

• distance

7) As the amplitude of a sound wave increases, its _____.

• pitch decreases

• pitch increases

• volume decreases

• volume increases

1) A piece of transparent material with at least one curved surface -

• opaque

• convex

• lens

• prism

2) When light rays strike the surface of a concave mirror, they are reflected and _____.

• grow dimmer

• come closer together

• lose energy

• spread farther apart

3) When light rays strike the surface of a convex mirror, they are reflected and _____.

• grow brighter

• come closer together

• gain energy

• spread farther apart

4) curving outward -

• concave

• convex