Chapter 15.2, Problem 17PP

(a)

To determine

The vibrating object that produce sound in human voice.

Answer to Problem 17PP

Vocal cords

Explanation of Solution

Introduction:

Sound is the form of energy which is produced by the vibrations of object about its mean position. In another way, it can be also defined as it a type of vibrations which travels through the medium or air as mechanical audible wave.

The vibrating object forces medium around it to vibrate,so it creates movement in the molecules present in its surrounding. These molecules make collisions with the other neighbor molecules and transfer energy from one molecule to another. This way the sound energy moves from one place to another.

In human, the primary source of sound is vocal cord. When human speaks, the air starts flowing from lungs and it comes through the narrow slit of throat and it cause vibrations of vocal cords.

This way human produces sound.

(b)

To determine

The vibrating object that produce sound in clarinet.

Answer to Problem 17PP

Reed

Explanation of Solution

Introduction:

Sound is the form of energy which is produced by the vibrations of object about its mean position. In another way, it can be also defined as it a type of vibrations which travels through the medium or air as mechanical audible wave.

The vibrating object forces medium around it to vibrate, so it creates movement in the molecules present in its surrounding. These molecules make collisions with the other neighbor molecules and transfer energy from one molecule to another. This way the sound energy moves from one place to another.

Clarinet is the instrument made up of wood. When the air is blown in between the mouthpiece and the single reed, fluid sound is produced.

Player presses the keys with his fingers and is be able to produce various notes very quickly.

Hence, reed in the clarinet plays a very vital role as it makes the air blown into the clarinet and vibrates.

(c)

To determine

The vibrating object that produce sound in a tube.

Answer to Problem 17PP

Player's Lips

Explanation of Solution

Introduction:

Sound is the form of energy which is produced by the vibrations of object about its mean position. In another way, it can be also defined as it a type of vibrations which travels through the medium or air as mechanical audible wave.

The vibrating object forces medium around it to vibrate, so it creates movement in the molecules present in its surrounding. These molecules make collisions with the other neighbor molecules and transfer energy from one molecule to another. This way the sound energy moves from one place to another.

Tube is an instrument made up of brass. Sound from this instrument originates from the vibrating column of air inside it. When the air is blown through the funnel shapes (mouthpiece) of the instrument, this column starts vibrating, and sound is produced.

Hence, player’s lips produce sound in tuba

(d)

To determine

The vibrating object that produces sound in a violin.

Answer to Problem 17PP

Strings

Explanation of Solution

Introduction:

Sound is the form of energy which is produced by the vibrations of object about its mean position. In another way, it can be also defined as it a type of vibrations which travels through the medium or air as mechanical audible wave.

The vibrating object forces medium around it to vibrate, so it creates movement in the molecules present in its surrounding. These molecules make collisions with the other neighbor molecules and transfer energy from one molecule to another. This way the sound energy moves from one place to another.

Spectacular sound is produced through the vibration of the string. A bowed string starts vibrating and moves in a circular motion that creates the fundamental tone.

Hence, string produce sound in violin.