Characteristics of sound,teacherpres,pptPresentation Transcript
WHAT AM I?
Is there a relationship between the amplitude of sound and the loudness of sound?
Loudness and amplitude of sound is directly proportional to each other. The greater the amplitude of the sound wave that reaches your eardrum, the greater the perceived loudness of the sound.
What characteristic of sound helps us to identify sources of sound?
Timbre or tone quality of a sound is used to distinguish between two different sounds. This tone quality is very important since it helps us to identify what produced the sound.
What are the different factors affecting the pitch of a sound?
Factors affecting the pitch of a sound:
Lengthening of the string
The shorter the length of the string, the higher the magnitude of the pitch.
Thickness of string
As the diameter of a string decreases the pitch of the sound wave increases
Tautness of string
The tighter the string is, the greater of pitch of sound is produced.
Length of air column
- the shorter the air column the greater the pitch of sound.
How is frequency and pitch related?
The greater the frequency of sound wave, the higher the pitch of sound wave produced.
What are the characteristics of sound?
Characteristics of sound wave:
Loudness of sound largely depends on the intensity of sound.
The greater the amplitude, the louder the sound produced
The measure of the energy per unit time transmitted through a unit area by the sound wave.
Intensity levels are expressed in decibels (dB)
2. Pitch and frequency.
Pitch refers to the highness or lowness of sound
The pitch sound depends on the frequency
The greater the frequency, the higher the pitch of sound
3. Timbre or tone quality.
Timbre or tone quality of a sound is used to distinguish between two different sounds.
Tone quality is very important since it helps us to identify what produced the sound.
Sound can be pleasant or unpleasant. Noise is categorized as an unpleasant sound. Most countries are now affected not only by air pollution . Both are harmful to one’s health. For instance, noise caused by the honking of horns, shrilling voices and scuffling of feet can aggravate a sick person’s condition. Scientists have found out that people get more work done in quiet places than in noisy areas. In fact, a person can do 25% more work in a quiet room. Knowing all these:
How would you behave in the school campus during your vacant periods?
How would you walk along the corridors?
What must be your behavior in the library? In the canteen? Why?
Why are “Quiet” signs placed in hospitals?
How can the pitch of a vibrating string be made higher?
Tighten the string
Change to a thick string of a same kind
Reduce its length
a only C) a and c only
b only D) b and c only
2) The same note mi is played on a piano and on a violin. Which characteristic distinguishes the sound coming from the two instruments ?
3) Increasing the amplitude of a sound wave increases its
4) Increasing the frequency of a sound increases its
5) What happens to the pitch of sound wave when you decrease the length of air column?
Remains the same
None of the above
Describe how different sound is produced by musical instruments. (pp. 375 S&T IV)