how to use decibels units ? (please explain in easy way just in class 8 getting extra knowledge)
Answers
Answer:
Explanation:
You have to think about the decibel scale very carefully, because it's a logarithmic scale and it works in a different way to the scale on a ruler, which is a linear scale. On a ruler, a distance of 20cm is twice as long as a distance of 10cm and 30cm is three times as long. But the logarithmic decibel scale goes up in powers of ten: every increase of 10dB on the scale is equivalent to a 10-fold increase in sound intensity (which broadly corresponds with a doubling in loudness). That means a sound of 20dB is 10 times more intense than a sound of 10dB and a 30dB sound is 100 times more intense. A sound of 100dB is actually 1,000,000,000 times more intense than a sound of 10dB and not 10 times as intense, as you might suppose. That's why sounds high up the decibel scale (from about 85–200dB) are a major cause for concern: the sound waves carry so much energy that they will damage your hearing, sooner or later.
But how does all this translate into "loudness"—what we actually feel about the volume of a sound? The decibel scale is logarithmic because that's essentially how our ears respond. A 10-fold increase in sound intensity, measured as a 10 dB increase with a sound meter, would feel to us roughly like a doubling in loudness. Another 10-fold increase, and another 10 dB increase, would feel like another doubling. Putting those two things together, a 100-fold increase in sound intensity would give a 20 dB increase on our sound meter and feel like a quadrupling in loudness. So a sound of 100dB is 90dB louder than a sound of 10dB, which is a billion times more intense and 2×2×2×2×2×2×2×2×2 = 29 or roughly 500 times louder.
The Decibel Scale
From rustling leaves to jet engines, here's a quick guide to some everyday sounds...
level:
10dB Rustling or falling leaves. 1 1
20dB Watch ticking. 10 2
30dB Birds flying by. 100 4
40dB Quiet conversation. 1,000 8
50dB Louder conversation. 10,000 16
60dB Quiet traffic noise. 100,000 32
70dB+ Louder traffic 1 million 64
80dB+ Loud highway noise at close range 10 million 128
85dB Hearing damage after about 8 hours.
100dB Jackhammer (pneumatic drill) at close range 1 billion 512
100dB Hearing damage after about 15 minutes.
110dB+ Jet engine at about 100m 10 billion 1024
120dB Threshold of pain. Hearing damage after very brief exposure.
or refer to the picture for easy understanding
best of luck.pls mark as brainliest.
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Answer:
Explanation:
Level in Everyday example Times more Times louder
decibels intense
10dB Rustling or falling leaves. 1 1
20dB Watch ticking. 10 2
30dB Birds flying by. 100 4
40dB Quiet conversation. 1,000 8
50dB Louder conversation. 10,000 16
60dB Quiet traffic noise. 100,000 32
70dB+ Louder traffic 1 million 64
80dB+ Loud highway noise at close range 10 million 128
85dB Hearing damage after about 8 hours.
100dB Jackhammer (pneumatic drill) at close 1 billion 512