Saturday
April 19, 2014

Posts by Ling


Total # Posts: 41

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

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

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

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

chemistry
Is 39.2 in eV?

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

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

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

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

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

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

Chemistry
Thank you

Chemistry
Thanks

Chemistry
B) is not 45 and A) is not 18

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 6.9...

Chemistry
Thank you

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.

Chemistry
Thank you for the explanation.

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 m...

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

chemistry
Could someone insert the data into the formula?

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

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)

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)

Chemistry
What is b) ?

Chemistry
How to input the data into the formula?

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

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 thi...

Chemistry
Thank you

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 exot...

Chemistry
What is b and c?

Chemistry
Had wrong for question two with I

math
x÷4-30=x÷32/5

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 limi...

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 thro...

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.

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?

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 "everlast...

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 sa...

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...

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 par...

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