presentation of sound unit 10
TRANSCRIPT
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SUBJECT : SCIENCESUBJECT : SCIENCE
BYBY
MS. naila anjumMS. naila anjum
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Sound
Unit :10
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Overview
• The Facts of Sound• Examples of objects produces sound
• The Ear and Sound• Sound Vocabulary
• Musical Instruments and Sound
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The Facts
Sound …
1. Is a form of energy produced & transmitted by vibrating matter
2. Travels in waves3. Travels more quickly through
solids than liquids or gases
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Kinds of sounds
1. Musical sound: Musical sound results when regular vibrations of the voice or a musical instrument are produced.
2. Noise sound: Noise results when irregular vibrations are made at irregular times.
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Examples of things which produces sounds
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The Ear• Sound is carried to our ears through
vibrating air molecules.• Our ears take in sound waves & turn
them into signals that go to our brains.• Sound waves move through 3 parts of
the ear; outer ear, middle ear, & inner ear.
Middle Ear
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Vibration
- Back and forth movement of molecules of matter
- For example,
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Compression- Where molecules are being pressed
together as the sound waves move through matter
- For example,- a wave travels through the springs just
like sound waves travel through the air- the places where the springs are close
together are like compressions in the air.
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Sound Waves
- Alternating areas of high & low pressure in the air
- ALL sound is carried through matter as sound waves
- Sound waves move out in ALL directions from a vibrating object
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Wavelength & Frequency
- Wavelength is the distance between one part of a wave and the same part of the next wave
- Frequency is the number of waves moving past a point in one second
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Pitch
• A measure of how high or low a sound is• Pitch depends on the frequency of a sound
wave• For example,
- Low pitch
- Low frequency
- Longer wavelength
- High pitch
- High frequency
- Shorter wavelength
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Reflection of sound
- An instrument that uses reflected sound waves to find underwater objects
- For example,
Animals use sonar or echo location to find their prey; these sounds have such a high pitch or frequency that the human ear cannot hear
Humans use sonar to locate or
map objects
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How sound waves reflected?
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What is echolocation?
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Sound and Instruments- Instruments can be played at
different pitches by changing lengths of different parts.
- For example, - Another way to make different
pitches is to change the thickness of the material that vibrates.
- For example,
A trombone’s mute absorbs some of the
sound waves produced, thus producing a softer
note when played.
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The End