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When you speak or sing, you are hearing your voice conducted through your body, and this sound is slightly lower in pitch than the sound carried through the air to a microphone or listener.

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Sound travels with a speed of 767 mph 1230 kmph but it cannot travel through a vaccum.

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Sound travels slower through air than by water. In fact, the speed of sound via water is 4.3 times faster than by air. However, sound does travel far faster through steel than both air and water.

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First, you hear the sound that comes out of your mouth ( the one that other people hear), and at the same time you hear that which is coming from vibrations produced by our vocal chords, which travel through our head. The bones in our skulls tend to enhance the lower-frequency vibrations, and that's why our voice sounds lower to us than it really is.

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• Empty vessels make the most sound
• As silent as the grave/dead
• I don’t want to sound like a busybody, but
• Love the sound of one’s own voice
• Ring hollow
• Sound the alarm
• Sound like a broken record
• Get the silent treatment
• The silent majority
• Safe and sound
• Keep mum
• Speak of the devil
• Hold your tongue

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If you want to hear how your voice really sounds, make a recording of it, or alternatively just cover up your left ear and speak.

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In order for a whip to crackle or make the noise it creates, it must travel faster than the speed of sound.

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The majority of cows that listen to music end up producing more milk than those who do not.

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Do you know what is louder than a car horn? The cry of a human baby, which is about 115 decibels.

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If it sounds too good to be true, it probably is

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If it sounds too good to be true, it probably is

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- different frequencies together
- white light
- 1K ppl talking together
- electronic devices, nature
- hissing

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Regular exposure to elevated sound levels that may lead to adverse effects in humans.

Less than 70dB: not harmful
More than 85dB for hours can be hazardous

Examples:
-traffic
-construction sounds
-household sounds

Diseases caused by it:
-Hypertension
-Hearing loss
-Sleep disturbancies

How can we avoid it?
-wear earplugs
-maintain level about 35-40db
-don’t use headphones at a high volume

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Goal -> to reduce noise pressure
-    means of soundproofing
- adding noise barriers
- using damping structures
- active antinoise sound generators
5 elements if soundproofing
- absorption
- damping
- decoupling
- distance
- adding mass