waves
Download
Skip this Video
Download Presentation
Waves

Loading in 2 Seconds...

play fullscreen
1 / 14

Waves - PowerPoint PPT Presentation


  • 166 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Waves' - diata


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
waves

Waves

Sound and Music

slide2
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.

slide3
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?

slide4
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?

slide5
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?

slide6
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?

slide7
When a force exerted on an object matches its natural frequency.

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?

slide8
They are inversely related.

When frequency goes up, wavelength goes down.

What is the relationship between frequency and wavelength of sound

slide9
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?

slide10
Instruments produce a mixture of different frequencies.

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

http://www.philtulga.com/resources.html

what time is it summary time
What time is it… SUMMARY TIME!

YOU HAVE 3MINUTES TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.

what time is it summary time1
What time is it… SUMMARY TIME!

YOU HAVE 2MINUTES TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.

what time is it summary time2
What time is it… SUMMARY TIME!

YOU HAVE 1MINUTE TO SUMMARIZE AT LEAST 5 THINGS YOU LEARNED TODAY. MAKE SURE YOU WRITE IN COMPLETE SENTENCES.

ad