A ringing phone is sealed under a glass dome. As air is pumped out, the phone keeps vibrating but the sound fades. What best explains the fading sound?

Two astronauts outside a spacecraft see each other wave. One shouts, but the other hears nothing through space. Why is the shout not heard?

A tuning fork vibrates under a glass dome full of air. As its sound passes through the air, how do the air particles move?

A string telephone works when the string is pulled tight between two cups. What does the tight string provide for the speaker's voice vibrations?

A bell rings under a glass dome full of air. A student near it hears it loudly, but a student across the room hears it faintly. Why?

A video shows a firework exploding on the Moon, but no sound reaches a nearby camera microphone. What condition explains this observation?

A buzzer is sealed in a bag of water, and a hydrophone outside the bag detects sound. What lets the sound reach the hydrophone?

A student claps once in an empty gym and hears the clap again a moment later. What causes the second sound?

A short ruler hanging off a desk buzzes with a higher pitch than a long overhang. What changed about the ruler's vibration?

Two tuning forks sound equally loud. Fork A vibrates 256 times each second, and Fork B vibrates 512 times each second. Which has higher pitch?

A musician tightens a guitar string, and it vibrates more times each second when plucked. What sound change should happen?

A flute note becomes higher when the vibrating air column is shortened. What wave property increased?

A mosquito whines near a slowly humming fan. The whine sounds high, and the hum sounds low. Which statement compares the two sound waves in the same air?

On a sound app, Tone X shows 100 cycles each second and Tone Y shows 300 cycles each second at equal amplitude. Which tone sounds higher?

A student cuts a drinking straw whistle shorter. The note becomes higher. What explanation fits this change?

Two speakers play pure tones through the same air. One tone has a shorter wavelength and higher frequency. What difference will listeners hear?

A singer raises the pitch of a note without getting louder. What must increase in the sound wave?

A drummer hits a drumhead harder, and nearby students hear a louder sound. What wave change best explains this?

A speaker cone moves back and forth farther while playing the same note. What will most likely happen to the sound?

Two sounds in air have the same frequency. Sound A has a larger amplitude than Sound B. Which statement is true?

A student whispers, then says the same word with more energy. What happens to the sound wave reaching a listener?

A phone's volume is turned up while the pitch of a ringtone stays the same. What property mainly increased?

A guitar string is plucked gently and then more strongly at the same note. Why is the second sound louder?

A sound sensor shows bigger pressure changes when a siren gets louder but keeps the same pitch. What caused the bigger changes?

A cymbal crash sends more energy into the air than a light tap. What does the extra energy mostly change?

A student hears a train through a steel rail before hearing it through the air. What explanation fits the earlier sound?

Two classmates tap on opposite ends of a wooden table. One hears the tap through the table and through the air. Why can both paths work?

A coach claps above water, and swimmers hear a muffled sound underwater. What does this show about sound transmission?

A foam panel is placed on a classroom wall, and echoes become quieter. What is the panel doing to the sound?

A metal spoon tapped against a cup sounds loud through a table, but softer through a towel. What explains the difference?

A knock is clearer through a closed wooden door than through a thick blanket hung over it. What property of the materials matters?

A screen shows Wave A with tall crests close together and Wave B with short crests far apart. Which comparison is supported?

A sound display shows two waves with equal height. Wave P has more cycles in the same time than Wave Q. What difference is shown?

A display shows Wave M taller than Wave N, but their crests are equally spaced. What does the display show about the sounds?

A screen shows a sound wave over time. Which measurement would tell you the sound's frequency?

A screen shows Wave C with low height and tightly spaced cycles. What sound does that pattern represent?

A tuning fork is struck and held near an ear. What sequence lets the student hear it?

When a person speaks, vocal cords vibrate inside the throat. What carries that vibration to a listener across the room?

A speaker plays a bass note. Its cone moves in and out, and a listener's eardrum vibrates. What happened between them?

A bell is struck, vibrates, and then a student hears it. What role does the ear play at the end of the sound pathway?