Science & Mathematics - 18 July 2006

What happens if you split a laser beam into two beams of equal power and then recombined them 180 degrees out of phase. Thereby heterodyning the two beams. I.E. the peaks of the sine wave of one beam would match up with the valleys of the sine wave of the other laser beam. Would you not get a DC electric current (because the heterdyne mixing of two frequencys that are exactly the same frequency should cancel out and create a DC current) and NO LIGHT or would you get something different than this? Any opinions?

2006-07-18 03:30:21 · 6 answers · asked by Anonymous in Physics

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A rectangular play ground is 12 yards longer than the width.?

If the perimeter is 92 yards, then what are the length and width?

2006-07-18 03:27:12 · 13 answers · asked by Brandon ツ 3 in Mathematics

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Who made our world?

2006-07-18 03:26:19 · 11 answers · asked by start_in_end 1 in Earth Sciences & Geology

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Is there something that you have observed around you which you wonder about?

2006-07-18 03:24:45 · 3 answers · asked by ertcelestial 2 in Other - Science

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Help please: Solve the system of equations?

y+x=2
y+x+3

2006-07-18 03:24:37 · 6 answers · asked by Brandon ツ 3 in Mathematics

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Is uv-vis spectrophotometry is applicable to analyze processed solns.' concentration (%) of IPA, KOH and HF?

Are there any reagents to add to these solutions so it can absorb in uv-vis? I have a client which used refractometer to analyze their processed solutions (HF, IPA, KOH content). However, they need to have alternative instruement since their refractometer model has not been sold in the market anymore. They wanted to try uv-vis since it's the only instrument that they have. If it's not applicable, what other methods of analysis are applicable to analyze concentration of these solutions. Their concentration range is (40-47%). They wanted to know if their processed csolutions are within the range. I think titration of KOH (colorimetric), and HF (potentiometric) is applicable. While for IPA, we can use GC. However, my client wanted, if possible, to analyze the three processed solutions using the same intstruemnt but not at the same time. They just want to purchase one kind of instrumetn so that it would not be too costy in their part. Thank you

2006-07-18 03:24:29 · 3 answers · asked by chin 1 in Chemistry

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is charles darwin's theories applicable today and if yes to what scale of 1 to 10?

2006-07-18 03:24:23 · 7 answers · asked by george k 1 in Biology

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Its been 37 years since we supposedly went to the moon.So with all our superior tech why haven't we gone back?

With our several advancements in space travel and forms of technology accross the board it doesnt make sense that we (human beings) havent been back to expand our territory or even go back to just play around or experiment more. Better yet if we are looking into the endless reaches of space for answers etc. why dont we set up a lauch site / station on the moon ...huh????

2006-07-18 03:23:33 · 19 answers · asked by fxbeto 4 in Astronomy & Space

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Who discovered that the DNA structure of the human body was a double helix and when?

I'm looking for Who discovered it? What clarified their findings? When they discovered it? Where they discovered it? How they arrived at the conclusion that the DNA of the human body was in a double helix structure? and last but not least...Why could they not be wrong in their findings? or were their findings just unproven theoretical computations that someone pushed forward to fill in the blank questionable areas in science that man had no answers for?

2006-07-18 03:20:40 · 6 answers · asked by Anonymous in Other - Science

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what are the disadvantages of large dams?

2006-07-18 03:17:32 · 9 answers · asked by COOLGAL 1 in Geography

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how many metals are liquid at room temperature?

2006-07-18 03:16:15 · 12 answers · asked by luqmaniack 1 in Chemistry

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how do you express the rate of reaction?

i know that the formula is 1 over the time taken but i don't know what to express my answer as, e.g. time would be seconds, lenght meters. i would appreciate immediate help as i am doing my coursework i need to know this for. could it be sec and then -1 in small ?

2006-07-18 03:15:01 · 4 answers · asked by BillyBob 1 in Biology

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Why we fell more hungry during the winter season?

2006-07-18 03:14:57 · 5 answers · asked by Anonymous in Biology

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Who do you think is the person with an IQ of161 but cannot answer 2+2?

He is German- borned and the first man who constructed the idea and formula to make the first atomic bomb. He died at the age of 80.

2006-07-18 03:14:07 · 9 answers · asked by Charles D 2 in Physics

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Will my wayward friend Dhiraj Khanna (born on 04 Jan 74 at 0535 hrs ) clear his critical professional exam ?

Exams are scheduled from 11Aug to 22 Aug 06. He was born in Pune, India.

2006-07-18 03:13:37 · 8 answers · asked by pradyumna m 1 in Other - Science

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The GForce a fundamental Force of all the four forces Universe?

Theory of Quantum Aether Dynamics has proven this force to exist?Five forces in Nature?

2006-07-18 03:11:29 · 2 answers · asked by goring 6 in Physics

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I m Ninad and u have answered correctly my wrong question....?

I wanna appreciate & thank all those friends who answered my qustion which i put wrongly.
"How can earth's shadow coveres almost (exact) the whole sun, making a very thin ring during a solar eclips."
I wanna add that i like most the answer of some one named "nuff said".
He got my point exactly.
I accidently placed this question for voting..but i wanted to slect his answer as best ..Thanx a lot .. "nuff said". I wish u to contact me if u read this ...
Actully the purpose of asking question was not to see how jenious answerer is (as some ppl tried to show). I m not much into astronomy. i m a computer student. I m interested in talking about strange thing happning in this universe and trying to share views.

Ninad

2006-07-18 03:08:21 · 1 answers · asked by RedishBlack 1 in Astronomy & Space

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how hot is it today? Its 104 here!?

2006-07-18 03:05:39 · 11 answers · asked by Anonymous in Weather