Help me to understand something

[Howard]

http://theory.uwinnipeg.ca/physics/bohr/node6.html

Scroll down to Problem 28.2. I don't understand the second line of equations (lambda = hc/E) . The value I get for hc/E is vastly different from 102.8nm. How is it supposed to work?

h is Planck's constant (6.63 x 10^-34 Joule-seconds), c is the speed of light (3 x 10^8m/s), and E is given as 12.1eV.

 

[Howard]

^

 

[Howard]

^?

 

[DurocShark]

Would probably help if in the subject you described what kind of help you need.

 

[AccruedExpenditure]

Your avatar has always bothered me. I don't know why.

 

[PowerMac4Ever]

this should help

 

[chuckywang]

You have to keep in mind that 1eV = 1.602 * 10^-19 J.

 

[Pantoot]

Or use planck's constant as 4.136e-15 eV-s.

 

[Ausm]

Originally posted by: Pantoot
Or use planck's constant as 4.136e-15 eV-s.

That would be my guess.

Ausm

 

[Howard]

Originally posted by: PowerMac4Ever
this should help

Seeing as you weren't able to offer any help, maybe you should take a look at that yourself.

To the others - thanks.

 

[artikk]

Originally posted by: Howard

Originally posted by: PowerMac4Ever
this should help

Seeing as you weren't able to offer any help, maybe you should take a look at that yourself.

To the others - thanks.

:thumbsup: