The figure shows two sound waves on identical axes. How does trace 2 differ from trace 1?

Two sound traces are shown on identical axes. What comparison is correct for trace 2?

Use the two sound traces. Compared with trace 1, trace 2 would be heard as which sound?

The figure compares two sound waves on the same time scale. What changes from trace 1 to trace 2?

Look at the two oscilloscope-style traces. Compared with trace 1, trace 2 is best described how?

The two sound traces use identical axes. What would a listener notice about trace 2 compared with trace 1?

Use the speed table. A sound pulse travels 740 m through fresh water at 20 °C. About how long does it take?

Use the table. How far does sound travel through steel at 20 °C in 0.010 s?

Use the table. In 2.0 s, how much farther does sound travel in fresh water at 20 °C than in air at 20 °C?

Use the table. A sound travels 171.5 m through air at 20 °C. What travel time should you calculate?

Which description best fits a sound wave traveling through air?

In a sound wave, what is a compression?

What is a rarefaction in a sound wave?

A singer changes from one note to a higher-pitched note. Which wave property increased?

A speaker plays the same note more loudly without changing the note. Which wave property mainly increased?

Which unit is commonly used for sound intensity level or loudness level?

Which frequency range is closest to the normal range of human hearing?

Why can sound not travel through a perfect vacuum?

In wave physics, what is a medium?

For sound traveling at constant speed in the same air, what happens to wavelength when frequency increases?

What does a sound wave carry from a vibrating source to a listener?

If two sounds in the same room have the same frequency but different amplitudes, what differs most directly?

Sound travels through air at 343 m/s at 20 °C. What is the wavelength of a 686 Hz tone?

A 440 Hz tuning fork makes a sound with wavelength 0.780 m in air. What is the wave speed?

Sound travels in seawater at about 1500 m/s at 20 °C. What is the frequency of a wave with wavelength 3.0 m?

A student shouts toward a cliff 102.9 m away. Sound travels at 343 m/s in air at 20 °C. How long after the shout does the echo return?

An echo returns 2.4 s after a shout. Using 343 m/s for sound in air at 20 °C, how far away is the wall?

A sonar pulse returns from the seabed 0.80 s after it is sent. Sound travels at 1500 m/s in seawater at 20 °C. How deep is the seabed?

A 200 Hz sound travels through air at 343 m/s at 20 °C. What is its wavelength?

A sound in air at 20 °C has wavelength 0.250 m and speed 343 m/s. What is its frequency?

You see lightning and hear thunder 5.0 s later. If sound travels at 343 m/s in air at 20 °C, about how far away was the lightning?

Sound travels through steel at about 5960 m/s at 20 °C. How long does it take to travel 29.8 m through the steel?

A bat emits a 40,000 Hz ultrasound pulse in air at 20 °C. If sound speed is 343 m/s, what is the wavelength?

A sound pulse travels 296 m through fresh water at 20 °C. If sound speed is 1480 m/s, what is the travel time?

An electric bell rings inside a sealed jar. As air is pumped out, the sound fades even though the clapper still moves. Why?

A student hears a distant train sooner by putting an ear to a steel rail than by listening through the air. Why?

Why would a movie explosion in empty space make no sound for a nearby astronaut outside a spacecraft?

On a warm day, sound in air travels slightly faster than on a cold day. What best explains this?

Astronauts speak to Earth by radio instead of sending ordinary sound through space. Why does radio work where sound does not?

A tone goes from air into water. Its frequency stays fixed by the source, but its speed increases. What must happen to its wavelength?