# Browsing Animations: Waves and Sound

### beats.iwp

The blue and green waves are superimposed to produce the red wave. When the frequencies are nearly the same, beats are produced. Determine the frequencies of the green and blue waves. Also determine the beat frequency. Note that the x-axis is a time axis. In order to spread out the waves for easier viewing, click on the Window tab above and change the value of X Max to something smaller.

### doppler4.iwp

A source of point spherical waves moves along the x-axis at constant velocity. The current position of the source is indicated by a red dot. Note that the spacing of the dark, vertical grid lines is 200 m. Determine the period of the wave, the velocity of the wave, the velocity of the source, the frequency perceived by an observer at the right edge of the screen, and the frequency perceived by an observer at the left edge of the screen.

### doppler5.iwp

A source of point spherical waves moves along the x-axis at constant velocity. The current position of the source is indicated by a red dot. The spacing of the dark, vertical grid lines is 200 m. Determine the Mach number of the source.

### doppler4.iwp

A source of point spherical waves moves along the x-axis at constant velocity. The current position of the source is indicated by a red dot. Note that the spacing of the dark, vertical grid lines is 200 m. Determine the period of the wave, the velocity of the wave, the velocity of the source, the frequency perceived by an observer at the right edge of the screen, and the frequency perceived by an observer at the left edge of the screen.

### doppler5.iwp

A source of point spherical waves moves along the x-axis at constant velocity. The current position of the source is indicated by a red dot. The spacing of the dark, vertical grid lines is 200 m. Determine the Mach number of the source.

### plucked-cord.iwp

This animation represents waves on a string plucked at its center. The yellow line is the actual waveform that would appear. This can be thought of as the superposition of two waves (blue and red) that separate after t = 0, moving in opposite direcitons with equal speed, frequency, and wavelength. At any time, the sum of the blue and red waves is the yellow wave.

### doppler5.iwp

A source of point spherical waves moves along the x-axis at constant velocity. The current position of the source is indicated by a red dot. The spacing of the dark, vertical grid lines is 200 m. Determine the Mach number of the source.

### plucked-cord.iwp

This animation represents waves on a string plucked at its center. The yellow line is the actual waveform that would appear. This can be thought of as the superposition of two waves (blue and red) that separate after t = 0, moving in opposite direcitons with equal speed, frequency, and wavelength. At any time, the sum of the blue and red waves is the yellow wave.

### trav-wave-3.iwp

Consider the following model of a linear medium such as a string: a chain of point masses joined by light, strong threads. Traveling waves of constant frequency and wavelength are generated on the medium. The motion of the wave is to the right while the motions of the point masses are vertical. Two particles are marked different colors than the rest. You can display y vs. t graphs of their motion by clicking Show graph.

### plucked-cord.iwp

This animation represents waves on a string plucked at its center. The yellow line is the actual waveform that would appear. This can be thought of as the superposition of two waves (blue and red) that separate after t = 0, moving in opposite direcitons with equal speed, frequency, and wavelength. At any time, the sum of the blue and red waves is the yellow wave.

### trav-wave-3.iwp

Consider the following model of a linear medium such as a string: a chain of point masses joined by light, strong threads. Traveling waves of constant frequency and wavelength are generated on the medium. The motion of the wave is to the right while the motions of the point masses are vertical. Two particles are marked different colors than the rest. You can display y vs. t graphs of their motion by clicking Show graph.

### wavedraw.iwp

This applet draws standing wave forms. Diagrams may be screen-captured and imported into documents.