NewScientist The Last Word - Tag 'science' details

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WHY do some chemical reactions of two colourless reagents produce a product with colour? Eg: N2(colourless gas)+O2(colourless gas)=NO2(brown coloured gas)
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Asked by l3irus
on 2010-11-30 23:08:19

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Last edited on: 2010-12-01 12:29:49

Categories: Unanswered.

Tags: chemistry, colour, science, experiment, chemicalreaction.

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Does under-water radio really exist? In countless films I've seen scuba divers communicating with one another over radio and yet I understand that water absorbs radio waves so how does this work? Or is it just a Hollywood myth? Simon Forbes Hove
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Asked by lordforbes
on 2010-11-12 13:41:32

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Categories: Technology.

Tags: technology, science, diving.

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A lawn-mower pollutes like ten cars!

I read on the US Environment Protection Agency website, that using a petrol lawn mower produces more carbon dioxide in an hour than a car produces whilst covering 300 miles. I had assumed that, when burning petrol, all of the carbon combines with oxygen in the air so the co2 produced varies in proportion to the amount of fuel burnt? What have I missed?

Simon Forbes

Hove

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Asked by lordforbes
on 2010-11-12 13:30:03

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Categories: Environment.

Tags: science, engineering, Ecology.

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How do we wake up from sleep ? What process make up us to wake up from sleep ?
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Asked by vivekbelkonikar2010
on 2010-11-10 22:40:07

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Categories: Human Body.

Tags: humanbody, sleep, science.

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What if Einstein hadn't discoverd his famous equation? My question is If we or any scientist had not discovred E=mc2 ? What changes do we have in today's life? what are the famous equations of 21st century ? ! not all but some recent ?
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Asked by vivekbelkonikar2010
on 2010-11-10 22:16:34

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Categories: Domestic Science.

Tags: science, einstein, scientists, equation.

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Travelling of light my question is as we can see the sun with naked eye, it is older than 8 mintues (calculated as per light travels in one year). which means if we see the current space or maybe a galaxy or stars they are older to recent time so how can we see the recent activity of stars and galaxy? Are we looking old stuff of space ? Can we ever look at the newer stuff of space ?
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Asked by vivekbelkonikar2010
on 2010-11-10 22:05:16

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Last edited on: 2010-11-10 22:06:55

Categories: Our universe.

Tags: Space, science, lightspeed, Galaxy, spacetime, Travel.

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Why everyone has different DNA ? As My knowledge We are from simple one cell amiba animal . So why everyone has different dna ?
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Asked by vivekbelkonikar2010
on 2010-11-10 21:45:36

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Categories: Domestic Science.

Tags: science, DNA.

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Define science ?What is the real mean of science?
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Asked by rahuaka
on 2010-10-02 13:11:42

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Categories: Unanswered.

Tags: science.

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Why do piano and guitar strings create overtones that are sharp to the fundamental?

Though the middle A may be at 440 Hz, a grand piano will be increasingly flat in the lower octaves and increasingly sharp in the higher octaves.

All the strings have overtones sharp to their fundamentals. A piano tuner takes this into account when tuning.

A piano tuner told me this is referred to as temper.

Though well tempered scales are another matter.

Is the word temper correctly used here?

Why would the strings have overtones sharp to their fundamentals?

I have actually seen this effect displayed on a strobe tuner as outer rings of overtones rotating clockwise to the stationary fundamental.

Photo - Bruce T

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Asked by tbrucenyc
on 2010-09-21 19:58:56

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Last edited on: 2010-09-22 15:25:13

Categories: Unanswered.

Tags: science, musicalinstruments.

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How does my aerosol gas canister become so cold when used? I have a small aerosol can of pressurised gas for cleaning dust from computers. After a few seconds of use the can gets so cold that a thin layer of ice forms on the outside. What process causes this rapid cooling?
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Asked by juliannq
on 2010-09-14 20:04:56