E: 28.1.08 Win £25 amazon voucher - help needed

cherw1981 · 24 January 2008 at 6:57PM

http://www.whystudymaterials.ac.uk/students/competition.asp

<TABLE cellSpacing=2 cellPadding=2 width="100%" border=0><TBODY><TR><TD><LABEL for="Question 1">1. Which aluminium-based precious stone is used in laser technology?</LABEL>

<LABEL><INPUT type=radio value=Sapphire name=Q1> Sapphire</LABEL>
<LABEL><INPUT type=radio value=Diamond name=Q1> Diamond</LABEL>
<LABEL><INPUT type=radio value=Ruby name=Q1> Ruby</LABEL>
<LABEL><INPUT type=radio value=Emerald name=Q1> Emerald</LABEL>

</TD><TD> </TD></TR><TR><TD colSpan=2><LABEL for="Question 2">2. If rods of the same size were made of each of these materials, which would be the heaviest?</LABEL>

<LABEL><INPUT type=radio value=Gold name=Q2> Gold</LABEL>
<LABEL><INPUT type=radio value=Titanium name=Q2> Titanium </LABEL>
<LABEL><INPUT type=radio value=Aluminium name=Q2> Aluminium </LABEL>
<LABEL><INPUT type=radio value=Steel name=Q2> Steel
</LABEL>

</TD></TR><TR><TD colSpan=2><LABEL for="Question 3">3. Why is Kevlar used to make bullet-proof vests?</LABEL>

<LABEL><INPUT type=radio value="High resistance to corrosion" name=Q3> High resistance to corrosion </LABEL>
<LABEL><INPUT type=radio value=Inexpensive name=Q3> Inexpensive </LABEL>
<LABEL><INPUT type=radio value="Low density" name=Q3> Low density </LABEL>
<LABEL><INPUT type=radio value="High tensile strength" name=Q3> High tensile strength</LABEL>

</TD></TR></TBODY></TABLE>

NOSONDDU · 24 January 2008 at 7:08PM

found this on kevlar

Kevlar Protera is a high-performance fabric that allows lighter weight, more flexibility, and greater ballistic protection in a bullet proof vest design due to the molecular structure of the fiber. Its tensile strength and energy-absorbing capabilities have been increased by the development .....

so could it be High tensile strength?

paul16o · 24 January 2008 at 7:19PM

The first ever laser produced was based on the ruby, the red variety of corundum. While this laser has few applications, the Ti-sapphire laser is popular due to the relatively rare ability to tune the laser wavelength in the red-to-near infrared region of the electromagnetic spectrum. It can also be easily modelocked. In these lasers, a synthetically produced sapphire crystal with chromium or titanium impurities is irradiated with intense light from a special lamp, or another laser, to create stimulated emission.

So The answer is SAPPHIRE I think

krunchieuk · 24 January 2008 at 7:50PM

rubies are sapphires are made of aluminium and oxygen, rather than "crystallized charcoal".

gerturdeanna · 24 January 2008 at 8:40PM

If I seem to remember correctly from school..steel is the heaviest of the four

wallyberry · 24 January 2008 at 8:45PM

I'm guessing
1 is ruby, because of what the previous poster said.
2 is steel, as steel is made from iron
3 is high tensile strength, because it's unbreakable - a kind man from freecycle mended my son's Cranky the Crane with it when nephew chopped the string to pieces - he returned it saying that no-one would ever cut his string again!!!

Hope this helps, and hope it's all right!

Jenni

RuthMarianna · 24 January 2008 at 9:26PM

Sorry to upset all you guys who entered the comp already but the heaviest metal is definately GOLD. I found a metal weight calculator online and the gold is way heavier

paul16o · 24 January 2008 at 9:55PM

Sapphires are also a gemstone with a aluminium oxide make up as are Diamonds and Emeralds

I think I may just buy the tokens it will be less painful

Sapphire refers to gem varieties of the mineral corundum, an aluminium oxide (Al<SUB>2</SUB>O<SUB>3</SUB>), when it is a color other than red. Sapphire can be found naturally or manufactured in large crystal boules. Because of its remarkable hardness sapphire is used in many applications, including infrared optical components, watch faces, high-durability windows, and wafers for the deposition of semiconductors, such as GaN nanorods.

isitenough · 25 January 2008 at 4:24PM

Taken from HERE :
'Its history began in New York in 1960. On 7th July of that year, Theodore H. Maiman demonstrated a lamp which emitted a brilliant red line – a concentrated beam of light. And this is how the world’s first laser, which Maiman had constructed using the precious stone ruby, worked: a flash lamp was shone on the ruby causing some of the ruby molecules to oscillate.'

So I'm going with Ruby.
Thanks for all the effort peeps!

lilias · 25 January 2008 at 5:17PM

isitenough wrote: »

Taken from HERE :
'Its history began in New York in 1960. On 7th July of that year, Theodore H. Maiman demonstrated a lamp which emitted a brilliant red line – a concentrated beam of light. And this is how the world’s first laser, which Maiman had constructed using the precious stone ruby, worked: a flash lamp was shone on the ruby causing some of the ruby molecules to oscillate.'

but....according to Wiki "Titanium-doped sapphire (Ti:sapphire) produces a highly tunable infrared laser, commonly used for spectroscopy as well as the most common ultrashort pulse laser."

It sounds as if rubies may have been used first but sapphires are more commonly used now.

Polly_Pod · 25 January 2008 at 5:22PM

thanks for posting and thanks for all the help guys - fingers crossed for us all x

E: 28.1.08 Win £25 amazon voucher - help needed

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