Chemistry: Concepts and Applications

 
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078617987/179001/ch02_chapter.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>
<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078617987/179001/POWsolutions.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (0.0K)</a>

Teachers Notes:

Problem 1:
Using the equation c = λν, determine frequency in Hertz or sec^-1

a. green light: 3.00 x 10⁸m/sec x (1/557.7 nm) x (1nm/1 x 10^-9m) = 5.38 x 10¹⁴Hz or sec^-1
b. red light: 3.00 x 10⁸m/sec x (1/630.0 nm) x (1nm/1 x 10^-9m) = 4.76 x 10¹⁴Hz or sec^-1

Problem 2:
Using the equation E = hν or E = hc/λ determine energy of the photon

a. green light: 6.626 x 10^-34Jsec x (5.38 x 10¹⁴sec^-1)= 3.56 x 10^-19J
or 6.626 x 10^-34Jsec x (3.00 x 10⁸m/sec) x (1/557.7 nm) x (1nm/1 x 10^-9m) = 3.15 x 10^-19J
b. red light: 6.626 x 10^-34Jsec x (4.76 x 10¹⁴sec^-1)= 3.56 x 10^-19J
or 6.626 x 10^-34Jsec x (3.00 x 10⁸m/sec) x (1/630.0 nm) x (1nm/1 x 10^-9m) = 3.15 x 10^-19J