Total # Posts: 1,024
How is it a substance can emit photons of visible light after absorbing ultra violet photons but not with infrared radiation The re-emitted photons must be of lessor energy (longer wavelength) than the incident photons. In a one-photon absorption process, the absorbed photon ...
March 11, 2007
social studies Hinduism
Looking for information on hinduism: 1) Considering that Hiduism lacks a united belief system, what makes up the hindu religion? 2)What are the cultural and societal influences taht have made hinduism vital to the region in which it originated? 3) Explain the desire for ...
March 9, 2007
A student loaded a mixture, dissolved in 1cm3 of dichloromethane, CH2Cl2, onto a small flash chromatography column and then proceeded to elute with hexanes/ethyl acetate 10:1. He/she found that all of the mixture came off in the first 4 fractions, with no separation. What ...
February 18, 2007
The following two solvents systems were found to separate compounds x and y by flash column chromatography: X- hexanes/ethyl acetate 10:1 Y- hexanes/ethyl acetate 10:4 which is more polar X or Y? Which solvent system must be used first?
February 18, 2007
Need Major differences and commonalities apparent between Mexican Americans and Puerto Ricans Thank you for using the Jiskha Homework Help Forum. The first site will give you information about the different areas of the U.S. where they tend to live: http://encarta.msn.com/...
January 30, 2007
I need two to three charateristics of orientalism. How may orientalism and prejudice contribute to hate crimes against these groups? This site will give you the characteristics of Orientalism. http://en.wikipedia.org/wiki/Orientalism Very strange, I found your exact question ...
January 16, 2007
I HAVE A WOMENS CUFF BRACELET ,HEAVY,SMOOTH ,AND MADE OF BRASS INLAY OF COPPER .NO DESIGN, BUT HAS JEWELERS MARK INSIDE --SMALL ANCHOR WITH POINTS ON BOTTOM OR ANCHOR AND SMALL o AT TOP ---VERY SMALL --FEELS LIKE ENGRAVED --JEWELERS MARK ! IT IS USED AND I WONDER WHO MADE IT ...
December 17, 2006
A contest entrant has a .00001 probability of winning $5,000.00. If this is only prize and the entry fee is $20.00, then what is the expected value? Regardless of what you pay for an entry "ticket" its expected value is in this case (probability of winning) x (prize ...
December 12, 2006
Males make a mean of 531 on math SAT with standard deviation of 114. Minimum 600 score. what's the % of males that don't satisfy this requirement? Pregnancies usually distributed mean of 268 days and standard distribution 15 days. Baby born three week premature at ...
December 5, 2006
Using standard deviation. Normally distributed mean of 0 degrees standard deviation of 1.00 degrees celcius. 1. between 0 and 1.28 2. greater than 0.37 3. less than -0.92 4. between 1.50 and 2.50 5. between -0.90 and 1.95 6. less than 0 I don't know how to solve these ...
December 5, 2006
Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses re made and each question has 6 possible answers. My answer is 1/36 Assume that the data has a normal distribution and the number of observations is greater than 50. ...
December 4, 2006
the sum of a & b is twice as big as n That statementcan be written as the equation (a+b) = 2 n Are there any more parts to your question? It is not possible to say what a, b or n is, exactly. The equation is a relationship between the three numbers.
November 13, 2006
What is the differecne between a weaseler and a downplayer. Since this is not my area of expertise, I searched Google under the key words "weaseler downplayer" to get these possible sources: http://military.coastline.edu/classes/philosophy115/lessons/chapter4lesson8-...
October 19, 2006
What sources can users learn more about computers? Since you have a computer and access to the internet, you should use search engines to narrow your quest for information.
September 20, 2006
How do you know the state of an element or compound when writing chemical equations? Unless otherwise known, assume the state of the element at room temp. Here is the real problem. For aqueous compounds, ie, compounds dissolved in water, you have to have that given. There is a...
September 16, 2006
Distinguish between table salt dissolving in water and sugar dissolving in water. The formula for table sugar is C12H22O11. It freely dissolves in water as the sugar molecules; i.e., it is in solution as C12H22O11. On the other hand, table salt is NaCl. When it dissolves in ...
September 11, 2006
What a vibrating object dose to the air particles around it? It makes them move...creating pressure waves that propagte thru the air, which we detect as sound if it is in the "sound" frequency wave
June 16, 2005
what a vibrating object dose to the air particles around it? The vibrating object sends out a pressure-variation (sound) wave of compressions and rarefactions, with a frequency equal to the vibration rate.
June 16, 2005