Physics Chapter 25 Vibrations and Waves

Describe the wave that forms and what is transmitted when a stone is dropped in a pond.

A wave is produced that moves out from the center in an expanding circle. The wave transmits energy but not matter.

Circle the letter that describes the source of all waves. a. a temperature change b. a change in pressure c. something that vibrates d. an electrical current

C

Circle the letter of each statement about a pendulum that is true. a. A longer pendulum has a longer period. b. A shorter pendulum swings with a greater frequency. c. Mass does not affect the period of the pendulum. d. All pendulums swing at the same rate. 25.2 Wave De

Correct answers: A, B, C

Circle the letter of each statement about sound waves in air that is true. a. They carry energy. b. Air is the medium they travel through. c. They are a disturbance that moves through the air. d. Air molecules are carried along with the wave.

Correct answers: A, B, C, D

Wavelength

Distance between successive identical parts of a wave.

Amplitude

Distance from a midpoint to a crest.

Sounds waves are a(n)___________ that travels through the air.

Distrubance

Is the following sentence true or false? As the frequency of a vibrating source increases, the period increases.

False

Crest

High point on a wave.

List the two things that determine the period of a pendulum.

Length of the pendulum and the acceleration of gravity.

Trough

Low point on a wave.

The time it takes for one back-and-forth motion of a pendulum is called the

Period

What is simple harmonic motion?

The back-and-forth vibratory motion of a swinging pendulum.

Is the following sentence true or false? A sine curve is a pictorial representation of a wave.

True

Hertz

Unit of frequency.

Frequency

Vibrations per unit of time.