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Hi,

The answer I got is 435.3 nm.

Brian, you forgot to multiply by the speed of light and I think your factor of
10 should be (3 - 23 - (-34) + power for speed of light + conversion of m to
nm).

Lance


--- In thechemistrycluster@yahoogroups.com, BRIAN JENSEN <brianejensen@...>
wrote:
>
>
> 　
> 　
> http://www.astronomynotes.com/light/s3.htm
> Energy of light = h × f
> where h is a universal constant of nature called ``Planck's constant'' = 6.63
× 10-34 J·sec.
> 275 *10^3J/mol. / (6.023*10^23 electrons per mole)/(6.63x10-34J-sec)
> =275/6.023/6.63*10^(3+23-34) sec-1
> =6.887*10^-8 sec-1
> This is obviously wrong because frequency should be a high power of 10, not a
negative poser of 10. I got an F in Quantum mechanics.
> Regards,
> Brian Jensen
>
> --- On Thu, 11/12/09, MD under construction <jgfuentes87@...> wrote:
>
>
> From: MD under construction <jgfuentes87@...>
> Subject: [The Chemistry Cluster] Chemistry practice question
> To: thechemistrycluster@yahoogroups.com
> Date: Thursday, November 12, 2009, 3:47 PM
>
>
>  
>
>
>
> The energy required to dislodge electrons from sodium metal via the
photoelectric effect is 275 kJ/mol. What wavelength in nm of light has
sufficient energy per photon to dislodge an electron from the surface of sodium?
>
>
>
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

　
　
http://www.astronomynotes.com/light/s3.htm
Energy of light = h × f
where h is a universal constant of nature called ``Planck's constant'' = 6.63 ×
10-34 J·sec.
275 *10^3J/mol. / (6.023*10^23 electrons per mole)/(6.63x10-34J-sec)
=275/6.023/6.63*10^(3+23-34) sec-1
=6.887*10^-8 sec-1
This is obviously wrong because frequency should be a high power of 10, not a
negative poser of 10. I got an F in Quantum mechanics.
Regards,
Brian Jensen

--- On Thu, 11/12/09, MD under construction <jgfuentes87@...> wrote:


From: MD under construction <jgfuentes87@...>
Subject: [The Chemistry Cluster] Chemistry practice question
To: thechemistrycluster@yahoogroups.com
Date: Thursday, November 12, 2009, 3:47 PM


 



The energy required to dislodge electrons from sodium metal via the
photoelectric effect is 275 kJ/mol. What wavelength in nm of light has
sufficient energy per photon to dislodge an electron from the surface of sodium?








[Non-text portions of this message have been removed]

The energy required to dislodge electrons from sodium metal via the
photoelectric effect is 275 kJ/mol. What wavelength in nm of light has
sufficient energy per photon to dislodge an electron from the surface of sodium?

 I wll be grateful if someone provides me the following paper:
 
Design, synthesis and antidepressant activity of some N2-substituted nalidixic
acid hydrazides and their cyclized analogs.
Youssef, Adel F.; Omar, Farghaly A.; Elsherief, Hosney A.; Abuo-Rahma, Gamal El
Din A. A. Department of Pharmaceutical Medicinal Chemistry, Faculty of Pharmacy,
Assiut University, Assiut, Egypt. Bulletin of Pharmaceutical Sciences, Assiut
University (1998), 21(1), 15-26.

with regards
rajesh



       The INTERNET now has a personality. YOURS! See your Yahoo! Homepage.
http://in.yahoo.com/

[Non-text portions of this message have been removed]

BCBGC-10 Call for papers
 
The 2010 International Conference on Bioinformatics, Computational Biology,
Genomics and Chemoinformatics (BCBGC-10) (website:
http://www.PromoteResearch.org) will be held during 12-14 of July 2010 in
Orlando, FL, USA.  BCBGC is an important event in the areas of bioinformatics,
computational biology, genomics and chemoinformatics and focuses on all areas
related to the conference.
 
The conference will be held at the same time and location where several other
major international conferences will be taking place. The conference will be
held as part of 2010 multi-conference (MULTICONF-10). MULTICONF-10 will be held
during July 12-14, 2010 in Orlando, Florida, USA. The primary goal of MULTICONF
is to promote research and developmental activities in computer science,
information technology, control engineering, and related fields. Another goal is
to promote the dissemination of research to a multidisciplinary audience and to
facilitate communication among researchers, developers, practitioners in
different fields. The following conferences are planned to be organized as part
of MULTICONF-10.
 

International Conference on Artificial Intelligence and Pattern Recognition
(AIPR-10)
 International Conference on Automation, Robotics and Control Systems (ARCS-10)
International Conference on Bioinformatics, Computational Biology, Genomics and
Chemoinformatics (BCBGC-10)
International Conference on Computer Networks (CN-10)
International Conference on Enterprise Information Systems and Web Technologies
(EISWT-10)
International Conference on High Performance Computing Systems (HPCS-10)
International Conference on Information Security and Privacy (ISP-10)
International Conference on Image and Video Processing and Computer Vision
(IVPCV-10)
International Conference on Software Engineering Theory and Practice (SETP-10)
International Conference on Theoretical and Mathematical Foundations of Computer
Science (TMFCS-10)
 
We invite draft paper submissions. Please see the website
http://www.PromoteResearch.org for more details.
 
Sincerely
John Edward
Publicity committee




[Non-text portions of this message have been removed]