Help me with science homework!!! PLZ!! :]?

Question

i have to fill in the gaps...so plz help me...ASAP!

Sound

_a_e (Series of compressions and rarefactions)

_ ar_ _ _ _ (Detects sound)

_ _ tra _ _ _ _ c (Type of sound wave cannot be heard by humans)

o _ _ _llo_ _ _ _ _ (Device for displaying graphs of pressure caused by sound)

_ _ _ (The speed of sound in _ _ _ is about 330 metres per second)

THX :]

Answer 1

Ultrasonic,

Air.

Figure out where they go.

Answer 2

wave (Series of compressions and rarefactions)

eardrum (Detects sound)

ultrasonic (Type of sound wave cannot be heard by humans)

Oscilloscopes (Device for displaying graphs of pressure caused by sound)

air (The speed of sound in air is about 330 metres per second)