Final Exam Sound Waves Grade 9

What is the function of the outer ear?

• To increase the size of the vibrations

• To convert vibrations into electric signals for the brain to interpret

• To collect sound waves and direct them into the ear canal

• To maintain balance

Sound travels as

• transverse waves.

• shock waves.

• airwaves.

• longitudinal waves.

Which part of the ear increases the size of the vibrations of sound waves entering the ear?

• Outer ear

• Ear canal

• Middle ear

• Inner ear

A(n)……………… is necessary for sound to travel from its source to a listener.

One of the most common types of hearing loss is called ……………, which results from long-term exposure to loud sounds.

When you double the distance between yourself and a loud sound, the sound’s intensity to your ears will be ………………… of what it was before.

• one-half

• one-third

• one-fourth

• two-thirds

Name the three bones in the middle ear (respectively) that act as levers.

………………… is a measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave.

• Amplitude

• Loudness

• Pitch

• Frequency

Sound travels at 343 m/s through air at a temperature of 20 degrees Celsius. How far will sound travel in 20 degrees Celsius air in 5 s?

Answer: …………………… (use word spacing between the number and unit. Exp: 20 cm)

The speed of sound in steel at 20 degrees Celsius is 5200 m/s. How far can sound travel in 5 s through steel at 20 degrees Celsius?

Answer: ………………………(Use word spacing. Example: 20 cm)