Tuesday
October 21, 2014

Posts by Ling


Total # Posts: 42

chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

Chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

Chemistry
a) 6.22*10^18 b)wavenumber= Eg / hc Eg(Silicon band energy)= 1.11 eV (to joules) h=6.6*10^-34 c=3*10^8 wavenumber= Eg*1.6*10^-19 / hc = 896969.69
January 12, 2013

CHEMISTRY
a) 6.22*10^18 b)wavenumber= Eg / hc Eg(Silicon band energy)= 1.11 eV (to joules) h=6.6*10^-34 c=3*10^8 wavenumber= Eg*1.6*10^-19 / hc = 896969.69
January 12, 2013

chemistry
Is 39.2 in eV?
January 12, 2013

Chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

science
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

Chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 12, 2013

chemistry
a) 6.22*10^18 b)wavenumber= Eg / hc Eg(Silicon band energy)= 1.11 eV (to joules) h=6.6*10^-34 c=3*10^8 wavenumber= Eg*1.6*10^-19 / hc = 896969.69
January 12, 2013

Chemistry
Thank you
January 11, 2013

Chemistry
Thanks
January 11, 2013

Chemistry
B) is not 45 and A) is not 18
January 11, 2013

Chemistry
(a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2 at 10 atm is 6....
January 11, 2013

Chemistry
Thank you
January 11, 2013

Chemistry
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 5.908 X 10^-10m . Determine the frequency (in hz) of the interacting photon.
January 11, 2013

Chemistry
Thank you for the explanation.
January 11, 2013

Chemistry
(a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. (b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse ...
January 11, 2013

Chemistry
First find: E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 Once E is found the find frequency: frequency(hz)= E / h
January 11, 2013

chemistry
Could someone insert the data into the formula?
December 15, 2012

chemistry
same here, how to insert the data into the formula?
December 14, 2012

chemistry
Step 1: (0.5*7715.0 - 7715.0)/ (165.0 - 7715.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=61.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)
December 14, 2012

Chemistry
Step 1: (0.5*6910.0 - 6910.0)/ (379.0 - 6910.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=13.0 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)
December 14, 2012

Chemistry
What is b) ?
December 14, 2012

Chemistry
How to input the data into the formula?
December 14, 2012

Chemistry
Had 3.24888828e-07 but place 777.78 and had wrong answer. What when wrong?
December 14, 2012

Chemistry
Answer the following questions by referring to the Cu-Al phase diagram shown below. (a) What is the lowest temperature at which a liquid can be found in a system of any composition of Cu-Al ? (b) A common alloy composition used in airplanes is 4 at. % Cu - 96 at. % Al. For ...
December 13, 2012

Chemistry
Thank you
December 13, 2012

Chemistry
Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an endothermic or an ...
December 13, 2012

Chemistry
What is b and c?
December 11, 2012

Chemistry
Had wrong for question two with I
December 11, 2012

Chemistry
48
November 22, 2012

math
x÷4-30=x÷32/5
April 10, 2012

college chemistry MEASURMENTS
some states have reduced the legal limit for alcohol sobriety from 0.10% to 0.08% alcohol by volume in blood plasma. a) how many mL of alcohol are in 3.0 qt of blood plasma at the lower legal limit? b)how many lL of alchol are in 3.0 qt of blood plasma at the higher legal ...
September 11, 2010

Programming
Can you create a java program that will make a CPU SCHEDULER w/ First Come First Serve,Round Robin,Priority Scheduling(Preemptive & Non-Preemptive)& Shortest Job First(Preemptive & Non-Preemptive) that will compute for Waiting time,Average waiting time,turnaround time and ...
March 7, 2010

English
I meant Arnold's advice to the reader/audience. But to the above question i think he does agree from the last three lines. "not with lost toil" says a lot about how Arnold think will happen to people if they have faith.
December 14, 2009

English
Thank you so much! One last thing. Is he confining the hope to just religion and God? or can hope/faith be found in other things too?
December 14, 2009

English
Well the old english is killing me. But so far i think that Arnold using the conditions of london during the 1800s to show how important faith and hope is. The preacher in the poem found strength in religion and God, and Arnold is saying that if one can set up a "...
December 14, 2009

English
An analysis on East London By Matthew Arnold please?? 'Twas August, and the fierce sun overhead Smote on the squalid streets of Bethnal Green, And the pale weaver, through his windows seen In Spitalfields, look'd thrice dispirited. I met a preacher there I knew, and ...
December 14, 2009

accounting
Chosen by Asker Cash flows from operating activities- Cash received from customers $230,000 Cash paid for merchandise (115,000) Cash paid for wages and other operating expenses (81,000) Cash paid for interest (10,000) Cash paid for taxes (12,000) Net cash provided by operating...
November 29, 2009

Physics
Cn u plz gv explaination 2 d solutions bit by bit in brief? Cz i really dnt understand hw 2 apply d formula 2 solve it when i revise nw.Thnkz. [g=10 m/s^2 ]a particle P of mass m kg on a rough horizontal table. The coefficient of friction between P & the table is 1 /4. The ...
September 29, 2008

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