Focus on Sound As Energy

Focus on Sound As Energy

by Mr. Farmer

​What is Sound?

• Sound is energy.

• Sound energy makes things move, or vibrate​.

• Vibrations produce a sound wave which travels through matter.

• When sound waves are detected by your ears, the ears send a message to your​ brain.

​What Is A Sound Wave

• ​When you clap your hands, the sound waves cause particles in the air to vibrate.

• ​These particles move slightly forward and squeeze together.

• ​When the sound wave passes, the air particles move slightly back and spread out.

• ​The movement of a sound wave is:

  • ​being squeezed and spread out

Multiple Select

What is Sound? Choose ALL correct answers.

• Energy

• Vibration

• Matter

• Gas

Multiple Select

What are the 3 states of matter?

• Gas

• Solid

• Slime

• Liquid

Multiple Choice

Where can sound not travel?

• Solid

• Liquid

• Vacuum

• Molecules

Multiple Choice

What happens when the number of waves per cycle are low?

• Low Frequency

• High Frequency

Multiple Choice

What happens when the number of waves per cycle are high?

• Low Frequency

• High Frequency

Multiple Select

What is the range of frequencies that the human ear can hear?

Please select more than 1 answer.

• 20 Hz

• 200 Hz

• 2,000 Hz

• 20,000 Hz

​Properties of Sound Waves

• ​Wavelength: The distance from one point of a wave to the same point on another wave.

• ​Frequency: the number of waves passing a given point every second.

• ​Pitch: The difference in sound (How high or low a sound is)

Fill in the Blanks

The higher the pitch, the

the sound waves

​Properties of Sound Waves (cont.)

• ​Doppler Effect: Sounds waves change as they pass by an object.

  • ​Sirens get closer, the pitch is higher due to the tightly squeezed waves.

  • ​Sirens that pass by have lower pitch due to waves that are more spread out.

• ​Amplitude: the height of the sound wave.

• ​Decibel (dB): the unit of measurement for sound.

Multiple Choice

The change in pitch as the sound moves towards and away from you is called...

• Amplitude

• Doppler Effect

• Decibel

• Sound Wave

Multiple Choice

Loud sound waves have a ______ amplitude

• smaller

• higher

Multiple Choice

The lower the decibel, the _______ the sound

• louder

• quieter

​Transmission of Sound Waves

• ​Particles in solids are packed tightly, or dense.

• ​Do to the denseness of solids, they make a great MEDIUM for sound to travel through.

• ​The denser the object, the more quickly the sound travels.

  • ​Most dense to least dense: Solid, liquid, gas

​Transmission of Sound Waves (cont)

• ​Reflection

  • ​When sound waves hit a surface, some waves bounce off the surface.

  • ​The rest of the waves travel through the material.

  • ​When the sound is reflected back, it is called an echo

​How Do We Hear

• Three Main Parts Of Our Ears

  • ​Outer

  • ​Middle

  • ​Inner

• ​Sound enter ear and causes eardrum to vibrate.

• ​Fluid inside inner ear vibrates in waves.

• ​Tiny hairs attached to nerves receive vibrations.

• ​Hair movement produces nerve impulses that the brain translates.