Exam 15: Wave Motion

A speedboat moving at 20.6 m/s sounds a signal on its horn, producing a tone of 320 Hz. There is no wind, and the speed of sound in air is 329 m/s. The apparent frequency of the sound heard by an observer in another boat moving in the opposite direction and approaching the first at a speed of 15.4 m/s is

Car A moves at speed v toward car B, which is at rest. The frequency of car A's horn is observed by car B to be f. What is the frequency of car A's horn as heard by an observer in car B if car A is at rest and car B moves at speed v toward car A (assume there is no wind)?

During the passage of a longitudinal wave, a particle of the medium

Which curve best illustrates the variation of wave velocity with linear density in a vibrating string?

A string under tension carries a transverse wave traveling at speed v. If the linear density of the string is doubled, what is the wave speed?

If the speed of sound is 331 m/s at 0 ^$\circ$ C and at temperature T it is 350 m/s, find T.

A string under tension carries a transverse wave traveling at speed v. If the linear density of the string is halved, what is the wave speed?

The curve that represents the speed of sound in a gas plotted against the kelvin temperature is

A woman drives toward the face of a cliff at 26.8 m/s. She sounds a burst on her 500-Hz car horn and then listens for the echo. Assuming 313 m/s to be the speed of sound, the woman hears an echo frequency of

If you were to reduce the amplitude of a wave on a string by half while keeping the speed and frequency of the wave constant, the energy delivered by the wave would

The angle of the shock wave shown in this photograph is closest to

A cord stretched to a tension F_T, consists of two sections whose linear densities are μ₁ and μ₂ (< $\mu$ ₁). A wave of frequency f and speed v is sent along the cord from one end. Which of the following statements is true about the transmitted and reflected waves?

Waves on the surface of a liquid are observed to have a wavelength of 12.9 mm and a speed of 30.9 cm/s. The frequency of the wave motion is

The observed pitch alone makes it possible to judge whether a sound source is

A police car siren emits a sound at 600 Hz. If an observer moves toward the source at 50 km/hr, and the police car approaches the observer at 100 km/hr (all speeds relative to the road), calculate the siren frequency heard by the driver of the police car (assume the speed of sound in air = 343 m/s).

Use the following scenario to answer the next question. A rope of length L and linear mass density $\mu$ is tied to the ceiling on one end. The other end is tied to a spring with spring constant k, and the spring is then attached to the floor, extending it by A. -The speed of a wave pulse at height h from the spring is

Use the following scenario to answer the next question. A rope of length L and linear mass density $\mu$ is tied to the ceiling on one end. The other end is tied to a spring with spring constant k, and the spring is then attached to the floor, extending it by A. -The time it takes for a wave pulse to travel from the bottom of the rope to the ceiling is

The object shown in the figure is

A wave is traveling with a speed v along the x axis in the positive direction. The upper graph shows the displacement y versus the distance x for a given instant of time. The lower graph shows the displacement y versus the time t for any given point x. From the information in the graphs, what is the wave speed v?

A particle is subject to a wave motion. Its distance from the equilibrium position at any particular time is called its