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Reflections on concepts
How can you explain the sound has energy. (AS)
2. What is the unit to measure the sound intensity (AS)
decibel
3. What are the differences between the noise and music?
Answers
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by bro Sunny
Answer:
1.Energy is moving around you all the time—energy in the form of sound waves. Sound waves are everywhere.
Even on the quietest night you can hear sounds. Close your eyes, hold very still, and listen for a moment. How
many different sounds can you hear?
Sound is a special kind of kinetic, or motion, energy. Sound is energy vibrating through substances. All sounds
are caused by vibrations—the back and forth motion of molecules. The molecules collide with each other
and pass on energy as a moving wave.
Sound waves can travel through gases, liquids, and solids. The sounds you hear are usually moving through
air. When a sound wave moves through air, the air molecules vibrate back and forth in the same direction as
the sound. The vibrations push the air molecules close together, then pull them apart.
2. We measure sound intensity (also referred to as sound power or sound pressure) in units called decibels. Decibels (dB)
Intensity
decibel (dB) – a measure of the intensity of a sound; 1/10 of a Bel.
Decibels are a relative unit comparing two pressures; therefore, a reference pressure must also be indicated. In underwater acoustics, the reference pressure is 1 microPascal, so the true unit of intensity for underwater sound is dB referenced to 1 microPascal. In air, scientists have agreed to use a higher reference pressure of 20 microPascals. Therefore, the true unit of intensity for sounds in air is dB referenced to 20 microPascal. Because they use different reference pressures, sound intensity given in dB in water is not the same as sound intensity given in dB in air.
3. NOISE.
Music is sound with a discrete structure. Noise is sound with a continuous structure. Music is composed of sounds with a fundamental frequency and overtones. Noise is composed of sounds with frequencies that range continuously in value from as low as you can hear to as high as you can hear — not necessarily at equal intensity, however. Music is described mathematically by an infinite sum of sines and cosines multiplied by appropriately valued coefficients — infinite mathematically, but in practice only a handful of overtones really matter. Noise is described by a spectral power distribution (or power spectrum), much like the statistical distributions of kinetic molecular theory. Music is ordered. Noise is random.
Noise is what you hear when you tune an analog radio or television to an empty frequency. It's the overall sound of rain falling on leaves, soda bubbling in a glass, air escaping from a tire, or a crowd applauding
MUSIC.
Music, art concerned with combining vocal or instrumental sounds for beauty of form or emotional expression, usually according to cultural standards of rhythm, melody, and, in most Western music, harmony. Both the simple folk song and the complex electronic composition belong to the same activity, music. Both are humanly engineered; both are conceptual and auditory, and these factors have been present in music of all styles and in all periods of history, throughout the world.
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