Exam 16: Waves and Sound

The car in the drawing is moving to the left at 35 m/s. The car's horn continuously emits a 2.20 × 102 Hz sound. The figure also shows the first two regions of compression of the emitted sound waves. The speed of sound is 343 m/s. -What is the frequency heard by a stationary observer standing in front of the car?

The tension in a taut rope is increased by a factor of 9. How does the speed of wave pulses on the rope change, if at all?

A periodic transverse wave is established on a string such that there are exactly two cycles traveling along a 3.0-m section of the string. The crests move at 20.0 m/s. -How long does it take a particle at the top of a crest to reach the bottom of an adjacent trough?

The displacement of a vibrating string versus position along the string is shown in the figure. The periodic waves have a speed of 10.0 cm/s. A and B are two points on the string. -What is the wavelength of the wave?

The speaker and two microphones shown in the figure are arranged inside a sealed container filled with neon gas. The wires from the microphones are connected to an oscilloscope (not shown). The signal from the microphones is monitored beginning at time t = 0 s when a sound pulse is emitted from the speaker. The pulse is picked up by microphone 1 at t₁ = 1.150 × 10^-2 s and by microphone 2 at t₂ = 1.610 × 10^-2 s. What is the speed of sound in neon gas?

Which one of the following statements concerning waves is false?

A transverse periodic wave described by the expression (where y and x are in meters and t is in seconds) is established on a string. Which one of the following statements concerning this wave is false?