What caused the card sculpture to fall?

• It was knocked down.

• Vibrations from a very loud noise.

• The card sculpture was too heavy.

• It didn't fall down.

Vibrations from the loudness of the jackhammer caused the card sculpture to fall. We know that ____ is created by vibrations.

• pressure
• heat
• sound
• light

Vibrations make ​ (a)   move in ​ (b)   . ​ (c)   waves to be exact.

• air
• waves
• Sound
• water
• light
• electricity

What do we hear when a sound wave hits a surface and come back at us?

• A vibration
• An echo
• A reflection
• A resonance

Organize each definition into the correct category.

Groups:

(a) Pitch

,

(b) Frequency

,

(c) Volume

• How loud or soft a sound is.

• The highness or lowness of a sound.

• The number of times a sound wave repeats in a second.

Are you enjoying the video lesson?

• Yes

• No

High pitch sounds have a ​ (a)   frequency. Low pitch sounds have a ​ (b)   frequency.

• high
• low
• medium, high
• low, medium
• high, very low

The louder the volume, the higher the wave. This is called ...

• Frequency
• Wavelength
• Pitch
• Amplitude

The louder the sound, the higher the ...

• decibel

• pitch

• frequency

• echo

Label the sound with the correct measurement of decibels. The sounds are in order from loudest to softest.

a

b

c

d

70 decibels

105 decibels

65 decibels

0-5 decibels