Physics: Sound Pitch Volume and How It Travels
Explore vibrations, pitch, loudness, and sound waves
Physics: Sound Pitch Volume and How It Travels
Explore vibrations, pitch, loudness, and sound waves
Physics - Grade 4-5
- 1
A guitar string makes a sound when it is plucked. Explain what is happening to the string and the air around it.
Think about something moving quickly back and forth.
The guitar string vibrates back and forth when it is plucked. The vibrating string pushes on nearby air particles, creating sound waves that travel through the air to your ears. - 2
Circle the object that would make the highest pitch: a short, tight rubber band or a long, loose rubber band. Explain your choice.
Higher pitch comes from faster vibrations.
A short, tight rubber band would make the highest pitch because it vibrates faster. Faster vibrations make higher-pitched sounds. - 3
A student taps a drum softly, then taps the same drum harder. What changes: the pitch, the volume, or both? Explain your answer.
The volume changes because the harder tap makes the drum vibrate with more energy. The pitch usually stays about the same because it is the same drum. - 4
Sound can travel through air, water, and metal. Why can sound travel through these materials?
Sound needs matter to move through.
Sound can travel through air, water, and metal because they are made of particles. The particles vibrate and pass the sound energy from one particle to the next. - 5
An astronaut in space cannot hear another astronaut speaking outside the spacecraft, even if they are close together. Explain why.
Sound cannot travel well where there are no particles.
The astronaut cannot hear the sound because space is almost a vacuum with very little matter. Sound needs particles, such as air particles, to carry vibrations. - 6
Look at two sound waves. Wave A has tall peaks and deep valleys. Wave B has short peaks and shallow valleys. Which wave has the greater volume, and why?
Wave A has the greater volume because it has a larger amplitude. A larger amplitude means the sound is louder. - 7
Look at two sound waves. Wave C has many waves close together. Wave D has fewer waves spread farther apart. Which wave has the higher pitch, and why?
Pitch depends on how fast the vibration happens.
Wave C has the higher pitch because its waves are closer together, which means it has a higher frequency. Higher frequency means higher pitch. - 8
A flute plays a high note, and a tuba plays a low note. Compare the vibrations that make these sounds.
The flute's high note is made by faster vibrations. The tuba's low note is made by slower vibrations. - 9
You press your ear gently against a table while a friend taps the other end. The tap sounds louder than when you listen through the air. Why might this happen?
Solids can carry vibrations from one place to another.
The tap can sound louder through the table because sound travels well through solids. The particles in the solid table are close together, so they pass vibrations along easily. - 10
A teacher asks students to make a softer sound with a triangle instrument. What should the student change when striking the triangle?
The student should strike the triangle more gently. A gentler strike makes smaller vibrations, which creates a softer sound. - 11
A whale makes low-pitched sounds that can travel long distances through ocean water. What medium is carrying the sound from the whale to another whale?
A medium is the material that a wave travels through.
The water is the medium carrying the sound. The whale's sound vibrations travel through water particles to reach another whale. - 12
A class makes a cup-and-string telephone. One student speaks into one cup, and another listens at the other cup. Explain how the sound travels.
The speaker's voice makes the first cup vibrate. The vibrations travel along the tight string to the second cup, which vibrates and makes sound for the listener. - 13
A siren gets louder as an ambulance comes closer to you. What is changing about the sound you hear, and why?
Nearby sounds often seem louder than faraway sounds.
The volume you hear is increasing because the ambulance is getting closer. The sound waves do not spread out as much before reaching your ears, so more sound energy reaches you. - 14
Fill in the blanks with the best terms: Pitch is how high or low a sound is. Volume is how _____ or _____ a sound is.
Volume is how loud or soft a sound is. Pitch tells about high and low sounds, while volume tells about loud and soft sounds. - 15
A student says, "All sounds travel at the same speed through every material." Is the student correct? Explain using what you know about sound.
Think about whether particles are close together or spread apart.
The student is not correct. Sound travels at different speeds through different materials, such as air, water, and solids, because the particles in each material are arranged differently.