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Rocelco B-Tech Rocelco BT77 Ultragrip Pro Loudspeaker Wall Mount - Pair (Black) List Price: $99.50 Sale Price: $79.99 Used From: $72.11  |
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Ultragrip Pro Side Clamping Speaker Wall Mounts (pair) for bookshelf speakers to 25kg (55Ibs) . Adjustable clamp size: 135mm (5.3") - 280mm (11"). Simple installation with all mounting hardware included... |
Another Science Guide help?!?!Please?
1.) Why doesn't sound travel through a vacuum?
Sound is a waveform in matter, and there is no matter in a vacuum
Vacuums absorb most of the sound
It does travel in space, as verified on Star Trek
2.) How do you make sounds from your vocal chords?
Vocal chords act like tiny loudspeakers, vibrating and forcing sound out your mouth
Air from your lungs passes over the vibrating vocal chords, making sound
It is a myth that your sound comes from vocal chords; it comes from your chest
3.) What happens when you blow across the top of a bottle?
The top of the bottle gets cold, making a squeaking sound
Air starts to circulate and vibrate in the bottle, making a sound
You must blow into the bottle for anything to happen
4.) What would the beat frequency be if you added tones of 880 Hz and 882 Hz?
2 Hz
881 Hz
1762 HZ
5.) Why can’t you hear an echo from a curved wall?
Not much sound reflects directly back to you
The sound is diffracted
Curved surfaces absorb the sound
1 a
2 a (and b is partially true)
3 b
4 a
5 a (but this question is inaccurate - sometimes you can)
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