Sound: Mixed Practice Printer Friendly Version
This page is a single submission. Correct answers will count as EC as long as you have work/calculations on notebook paper (signed and dated by Mr. Bishop) to back up your answers. Your papers are to be placed in the one-way box at the end of the period.

Refer to the following information for the next three questions.

The speed of sound increases with temperature. It is 331 m/s in air at 0°C and 343 m/s in air at 20°C. A hollow glass pipe vibrates with a frequency of 151 Hz.
 (a) What is the wavelength of the sound produced by the column of air in the pipe on a 0ºC day?

 (b) on a warmer, 20ºC, day?

 (c) How does air temperature affect the wavelength of the sound produced by the pipe?

Refer to the following information for the next question.

The driver of an ambulance turns on its siren as the ambulance heads east at 30 mph. A police car is following the ambulance at 30 mph. A truck behind the police car is moving at 20 mph. A van is traveling west in the opposite lane at 20 mph. A small car is stopped at the side of the road. The vehicles are positioned as shown.

 Rank the sounds perceived by the passengers in each of the five vehicles in order of decreasing frequency.

Refer to the following information for the next question.

A 330 Hz tuning fork is vibrating after being struck. It is placed on a table near but not directly touching other objects, including other tuning forks. Eventually one glass and one other tuning fork start vibrating.
 Explain why this happens.

Refer to the following information for the next three questions.

The first harmonic in a pipe closed at one end is 487 Hz.
 (a) Find the next two harmonic frequencies that will occur in this pipe.

 (b) If the speed of sound is 345 m/sec, what are the corresponding wavelengths of the first three harmonics?

 (c) What is the length of this pipe?

Refer to the following information for the next three questions.

The first harmonic in a pipe open on both ends is 487 Hz.
 (a) Find the next two harmonic frequencies that will occur in this pipe.

 (b) If the speed of sound is 345 m/sec, what are the corresponding wavelengths of the first three harmonics?

 (c) What is the length of this pipe?