be careful what you hear - smyrna · 24/01/2015 · be careful what you hear mark 4:24. the things...
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Be Careful What You Hear
Mark 4:24
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The Things You Hear
Affect you Physically
Affect you Spiritually
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Decibels (dB)The ear has the remarkable ability to
handle an enormous range of sound levels. In order to express levels of sound
meaningfully in numbers that are more manageable, a logarithmic scale is used,
rather than a linear one. This scale is the decibel scale.
What is a decibel? Zero decibels (0 dB) is the quietest sound audible to a healthy
human ear. From there, every increase of 3 dB represents a doubling of sound
intensity, or acoustic power.
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The relative loudness that we perceive is a subjective psychological phenomenon, not
something that can be objectively measured. Most of us perceive one sound to be twice as loud as another one when they are about 10
dB apart; for instance, a 60-dB air conditioner will sound twice as loud as a
50-dB refrigerator. Yet that 10-dB difference represents a tenfold increase in
intensity. A 70-dB dishwasher will sound about four times as loud as the 50-dB refrigerator, but in terms of acoustic
intensity, the sound it makes is 100 times as powerful.
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Here’s another way of looking at it: If the sound from one typewriter registers 60 dB, then ten typewriters clacking away would
register 70 dB (not 600 dB!), and they would sound only twice as loud as one typewriter. You would need 100 typewriters to reach a
noise level of 80 dB, and together they would sound only four times as loud as a
single typewriter. (http://www.noisehelp.com/decibel-scale.html)
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This is why listening to loud noises such as music can be harmful to our hearing. It does
not seem so loud to us, but it is!
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Using a meter let’s measure the sound level in our room.
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Now lets try human conversation
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Now let’s make it louder with some help
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What we hear affects us spiritually too.
Jesus said, “Take heed what ye hear.” (Mark 4:24)
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We need to hear the words of God:
Listen, O isles, unto me; And hearken, ye people, from far. (Isaiah 49:1)
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He that is of God heareth God’s words: ye therefore hear them not, because ye are not of God.
(John 8:47)
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So then faith cometh by hearing, and hearing by the word of God.
(Romans 10:17)