Exam 15: Wave Motion

A blue line in the spectrum of the hydrogen atom has a wavelength $\lambda$ = 486 nm.In the hydrogen-atom spectrum emitted by a distant galaxy,this line is observed on Earth at $\lambda$ = 550 nm.With what speed is this galaxy receding from us? (The speed of light is 3.0 $\times$ 10⁸ m/s.)

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)?

A string exactly two meters long has a mass of 10.0 g and is under a tension of 12.5 N.The speed of a transverse wave in this string is

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

A sinusoidal wave train is moving along a string.The equation giving the displacement as a function of position and time is where the units are SI.For a particle at x = 5 m when t = 2.4 s,the velocity of the particle is

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

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

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?

A triangular wave pulse as shown by the blue line can be formed by adding

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

A wave of frequency f is transmitted on a string with tension T.If the tension is increased by a factor of 4 and the frequency and amplitude are unchanged,the power transmitted changed by

A set of waves has a speed of 4.2 m/s and a frequency of 2.0 Hz.The wavelength is

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?

As a wave moves to the right in an elastic rope,a sequence of pictures (1 through 6)is taken at intervals of one second.An arrow points out a particle that is attached to the rope.If the width of the picture is 8 cm,this wave has a period of

Waves of amplitude 1.3 cm move along a 14-m long string that has a mass of 90 g and is under a tension of 18 N.If the average total energy of the waves in the string is 5 J,calculate the frequency of the waves.

Sound travels at 340 m/s in air and 1500 m/s in water.A sound of 256 Hz is made under water.In the air,

A sound source of frequency f moves with constant velocity (less than the speed of sound)through a medium that is at rest.A stationary observer hears a sound whose frequency is appreciably different from f because

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

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 wave moving in the positive x direction has an amplitude of 0.4 m,a frequency of 0.25 Hz,and a wavelength of 24 m.An equation,in which the units are SI,that might describe this wave is