A 256 Hz tuning fork makes an open pipe sound loud when the pipe length is adjusted. Which relationship is first needed to find the sound wavelength in the air?

A student writes: 'An astronaut could hear a spaceship explode in empty space if the explosion were loud enough.' Which correction is right?

A 512 Hz note travels through air at 343 m/s. What is its wavelength?

An ambulance siren passes a person at rest, and the pitch suddenly drops after it goes by. What changed for that person?

Use the wave figure. The rope is driven at 15 Hz. What is the wave speed?

A water wave enters shallow water, slows down, and its crests get closer together. Which relationship explains this if the source frequency is unchanged?

A student writes: 'Pitch depends on amplitude, so hitting a tuning fork harder raises its pitch.' Which correction is right?

A vibrating object has a period of 0.020 s. What is its frequency?

A tuning fork is struck harder, and a student nearby hears a louder sound at the same note. What happens to the wavelength of the sound in the air?

Use the wave figure. What is the amplitude of the transverse wave?

A laser passes through two narrow slits and makes bright and dark bands on a screen. Which relationship identifies the bright bands?

A student writes: 'A wave carries bits of the rope from the hand to the wall.' Which correction is right?

A rope wave has a wavelength of 0.75 m and a frequency of 4.0 Hz. What is its speed?

An oscillator doubles its frequency while shaking the same taut rope, and the wave speed on the rope stays the same. What changes?

Use the standing-wave figure. The string vibrates at 40 Hz. What is the wave speed on the string?

A tube closed at one end gives its lowest loud resonance. Which relationship connects the tube length L and wavelength λ for that resonance?

A student writes: 'When two pulses meet on a rope, they bounce off each other and go back.' Which correction is right?

A source vibrates at 2.5 Hz. What is its period?

A sound wave from a speaker enters water from air. Which statement describes the wave at the boundary?

Use the standing-wave figure. What is the distance between adjacent nodes?

A cart on a spring completes 12 cycles in 6.0 s. Which relationship finds both frequency and period from that observation?

A student writes: 'A higher-frequency wave on the same string always travels faster.' Which correction is right?

A student claps 85.75 m from a wall and hears the echo 0.50 s later. What speed of sound does this measurement give?

A person rides a bicycle toward a stationary warning horn. What changes for the rider?

Use the pulse figure. When the two pulses completely overlap, what is the rope's displacement at the overlap point?

A violin string of length L resonates with n loops between two fixed ends. Which relationship gives the wavelength of that pattern?

A student writes: 'Sound waves are transverse because they have crests and troughs like a rope wave.' Which correction is right?

You see lightning and hear thunder 3.0 s later. Using 343 m/s for sound, how far away was the lightning?

Water waves pass through a gap that is narrowed until its width is close to the wavelength. What changes most noticeably?

Use the marked wave figure. The marked points are separated by how many wavelengths?

Two nearby tuning forks produce a sound that gets louder and softer 6 times each second. Which relationship matches that observation?

A student writes: 'A heavier pendulum bob swings with a shorter period.' Which correction is right for small oscillations?

A string is 0.65 m long and fixed at both ends. If the wave speed is 260 m/s, what is the fundamental frequency?

Two identical wave crests arrive at the same place at the same time. What changes at that place?

Use the marked wave figure. What is the phase relationship between points P and Q?

A wave crosses a boundary at an angle and slows down as it enters a new medium. Which way does the wave bend?

A student writes: 'Resonance means any driving frequency makes the same large vibration.' Which correction is right?

An open-open pipe is 0.50 m long. Using 343 m/s for sound, what is its fundamental frequency?

A string is driven into a standing wave with more loops than before, while the wave speed stays the same. What changed?

Use the standing-wave figure. What is the wavelength of the wave on the string?

A rope pulse reaches a wall where the rope is fixed, then returns upside down. Which boundary relationship describes this?

A student writes: 'Nodes are the points on a standing wave that move the most.' Which correction is right?

A closed-open pipe is 0.25 m long. Using 343 m/s for sound, what is its fundamental frequency?

Air is pumped out of a bell jar while a bell inside keeps vibrating. What changes for an outside listener?

Use the wave figure. The source frequency is 120 Hz. What is the wave speed?

A student writes: 'Radio waves need air just like sound waves do.' Which correction is right?

A 600 Hz siren moves toward a stationary observer at 20 m/s. If sound speed is 340 m/s, what frequency is observed?

Two tones of 440 Hz and 444 Hz are played together. What beat frequency is heard?

An electromagnetic wave in vacuum has frequency $6.00\times 10^{14}$ Hz. Using $c=3.00\times 10^8$ m/s, what is its wavelength?

Use the two oscilloscope traces. Compared with trace B, what does trace A show?