CFA - NC.6.P.1.3

What is most likely to occur when a sound wave enters the brain's hearing center?

• The wave vibrates against the middle ear.

• The wave is sent back through the ear canal.

• The brain uses the sound wave to maintain balance.

• The brain interprets what the sound is and where it is coming from.

Why do sound waves travel faster through a solid than through a gas?

• The atoms in a gas are closer together than in a solid.

• The atoms in a solid are closer together than in a gas.

• A gas has more mass than a solid.

• A solid has more mass than a gas.

Which statement explains why dogs can hear a high-pitched whistle but humans cannot?

• Dogs can hear higher frequencies than humans.

• Dogs can hear lower frequencies than humans.

• Dogs can hear higher amplitudes than humans.

• Dogs can hear lower amplitudes than humans.

The diagram below shows a sound wave moving through air from a speaker to an ear.

• Electromagnetic

• longitudinal

• mechanical

• transverse

The diagram below shows the movement of two sound waves.

Which statement best explains how Wave 1 compares with Wave 2?

• Wave 1 has a louder sound.

• Wave 1 has a softer sound.

• Wave 1 has a higher pitch.

• Wave 1 has a lower pitch.

How does sound travel through a solid?

• by vibrating the molecules in the matter

• by moving in a straight line through the object

• by changing its speed as it moves through the object

• by remaining very still while traveling through the matter

Shown below, two tuning forks vibrate, displacing air particles in each compression of two sound waves.

What is the main difference between the two waves?

• the frequency

• the amplitude

• the wavelength

• the wave speed

The diagram shows the movement of two sound waves.

Which observation can be made about the two waves?

• Wave 1 is higher pitched than Wave 2.

• Wave 2 is higher pitched than Wave 1.

• Wave 1 is louder than Wave 2.

• Wave 2 is louder than Wave 1.

The table below shows the speed of sound at several different air temperatures.

How does temperature affect the speed of sound?

• The colder the air, the faster sound moves

• The warmer the air, the faster sound moves.

• The warmer the air, the slower sound moves.

• Air temperature has no effect on the speed of sound.

Joshua placed a playing card in a bicycle wheel so that the spokes would cause the card to vibrate. When he rode the bicycle fast, a high-pitched sound was produced, and when he rode the bicycle slowly, a low-pitched sound was produced. Which statement best explains why both high-pitched and low-pitched sounds were produced?

• The playing card only vibrated when the wheel was moving fast.

• The playing card only vibrated when the wheel was moving slowly.

• The playing card vibrated differently as the speed of the wheel changed.

• The playing card vibrated the same even though the speed of the wheel changed.