A few days ago
Anonymous

Urgent Chemistry Help?

I have a test tomorrow that I am not ready for. I need help with energy, wavelength, and frequency.

1. Can someone explain to me how to derive an energy equation for when an electron changes energy levels? Start with En=-B/n^2 (E to the n equals negative B divided by n squared).

2. Derive a wavelength equation for when an electron changes energy levels. Start with En=-B/n^2.

3. Tell me how to calculate frequency.

This would really help me a lot if I got some help.

Top 2 Answers
A few days ago
Anonymous

Favorite Answer

1. To answer your first question go to http://www.colorado.edu/physics/2000/quantumzone/frequency_algebra.html and scroll down to Equations (8) and Equation (9). Maybe you should try to memorize these equations by tomorrow.

3. Frequency = velocity / wavelength; frequency = the number of wave pulses (i.e crests) that pass a given point in one second. Frequency is measured in cycles per second – cps or Hertz – Hz

I don’t know exactly what you will be tested on tomorrow but I just found a short quiz you could skim over (the answers are included). Who knows maybe your teacher will ask one of these questions!!

http://www.wise.k12.va.us/jjk/Chemistry/ELECTRON.html

Plus, memorize the following equations . . .

speed = wavelength x frequency

energy = Planck’s constant x frequency

Lastly, Good Luck. I hope you do well but eh, even if you don’t it’s still the beginning of the school year and you can make sure that you go in 110% prepared for the next test. Good luck to ya though. Crossing my fingers for you.

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A few days ago
joecon113
This test is tomorrow? Well, I think you should have done some more studying rather than asking questions on here. Hey, here’s a thought… Pay attention in class? You might actually learn something, rather than sitting here sounding like an idiot, and later blaming your teacher for you not knowing anything from your chemistry class.
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