Posted by K on Sunday, November 4, 2007 at 2:02pm.
The electron from a hydrogen atom drops from an excited state into the ground state. When an electron drops into a lowerenergy orbital, energy is released in the form of electromagnetic radiation.
Part A: How much energy does the electron have initially in the n=4 excited state?
answer I got = 1.36*10^19 J
Part B: If the electron from Part A now drops to the ground state, how much energy is released?
Enter your answer numerically in joules.
answer= delta E= _____J
what equation should I use for to answer Part B & how do I plug in to get the correct answer?

CHEM  DrBob222, Sunday, November 4, 2007 at 2:12pm
How did you get the energy for N = 4? Use the same equation but plug in 1 for N = 1 (that's the ground state). Now subtract the energy in the two states to get the amount (the difference) relesed when the electron falls from n = 4 to n = 1.

CHEM  K, Sunday, November 4, 2007 at 2:22pm
I used: E = (Rhc)/n^2
R= 1.097*10^7 m^1
h= 6.6261*10^34 J s
c= 3.00*10^8 m s^1
E= (1.097*10^7)(6.6261*10^34)(3.00*10^8)/16
E= 1.36*10^19 J
so I just use final minus initial? How so?
when I do the same as above...but put in 1squared=1, rather than 4squared=16..
I get: 2.18064951*10^18
then should the answer be: 2.18065*10^18  1.36*10^19? = 2.04*10^18??

CHEM  K, Sunday, November 4, 2007 at 2:26pm
guess it was correct... the real answer, rounded though, came to be: 2.05*10^18J
thank you.

CHEM  DrBob222, Sunday, November 4, 2007 at 2:31pm
Using 2.180 x 10^18 I found 2.044 x 10^18 J for the difference in energy levels.

CHEM  john, Thursday, April 3, 2008 at 3:14pm
A microwave oven operates at 2.40 . What is the wavelength of the radiation produced by this appliance?

CHEM  Rita, Tuesday, March 31, 2009 at 9:02pm
.125m or 125000000nm

CHEM  Ramiz Alda, Sunday, November 22, 2009 at 2:42pm
Energy is an absolute value, the answer should be 2.05*10^18J, instead of 2.05*10^18J.

CHEM  sam, Monday, October 25, 2010 at 5:34pm
What is the wavelength lambda of the photon that has been released in Part B?

CHEM  ZAR, Wednesday, December 8, 2010 at 10:22am
E=hc/Lambda
2.05*10^18=(6.63*10^34)(3.00*10^8)/x
x=9.72*10^8 meters
Answer This Question
Related Questions
 chemistry  The electron from a hydrogen atom drops from an excited state into ...
 Chemistry  An electron is excited from the n=1 ground state to the n=3 state in...
 Chemistry  A hydrogen atom electron in an excited state with n = 7 drops to a ...
 Physics  Please help me answer the question below and also show equations and ...
 physics  Please help me answer the question below and also show equations and ...
 physics  You are shining ultraviolet light on a gas of an unknown element. You ...
 Physics  A hydrogen atom is in its third excited state (n=4). Using Bohr theory...
 physics  Hydrogen atom is initially in the ground state. It is excited by a ...
 physics  A monochromatic light beam with energy 204eV is used to excite the Be+...
 chemistry  A Li2+ ion had its electron in an excited state. When the electron ...
More Related Questions