Waves

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Waves - PowerPoint PPT Presentation

Waves. Sound and Music. What is sound wave? What causes a sound wave? Is it a transverse or longitudinal wave?. A wave of alternating high pressure and low pressure regions. Anything that vibrates in air It is a longitudinal wave because the air compresses in the direction of travel.

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Presentation Transcript

Waves

Sound and Music

What is sound wave?

What causes a sound wave?

Is it a transverse or longitudinal wave?

A wave of alternating high pressure and low pressure regions.

Anything that vibrates in air

It is a longitudinal wave because the air compresses in the direction of travel.

The loudness of a sound is measured in decibels (dB)

The louder the sound the higher the amplitude of the wave

What is loudness measured in?

What is the relationship between sound and amplitude?

It measures sound.

An increase of 20 dB means the wave has a 10 times greater amplitude

But, our ears perceives a 20 dB increase to be about twice as loud

What do you think the decibel scale measures?

We hear the different frequencies of sound as having a different pitch.

Low frequency has a low pitch

High frequency has a high pitch

Humans can hear from about 20 Hz to 20,000 Hz

Human ears are most sensitive for sounds between 100 and 2,000 Hz (range of speech)

What do we hear different frequencies of sound as?

What is the frequency range humans can hear?

Natural frequency is the how often the object vibrates.

The A string on a guitar has a natural frequency of 440 hertz

Natural frequency depends upon: tightness, length, or weight of the string

Tuning a guitar changes the natural frequency of string by changing its tension

What is natural frequency?

What does natural frequency depend on?

When resonance occurs only a small force is needed to get a large response.

If you shake a string at the right frequency, it makes a big wave motion. If your frequency is not just right, the string will not make a wave pattern at all

What causes a resonance?

How much force is needed?

They are inversely related.

When frequency goes up, wavelength goes down.

What is the relationship between frequency and wavelength of sound

The material the sound is traveling through.

Sound travels faster in a solid than in air.

Sound requires a medium to travel. As a result, sound DOES NOT travel in a vacuum.

What does the speed of sound depend on?

When does speed travel the fastest?

What is the one thing speed needs to travel?

Instruments produce a mixture of different frequencies.

Why does the same note sound different when its played on a different instrument?

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