New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

Chemistry L5 - Photoelectric

by: nichl

Chemistry L5 - Photoelectric 01:160:161

Marketplace > Rutgers University > Chemistry > 01:160:161 > Chemistry L5 Photoelectric

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

Bohr's Hydrogen Atom, photoelectric effect, emission spectra
General Chemistry I
Class Notes
General Chemistry, Chemistry, Photo Electric Effect, Bohr Model, Bohr Equation, kinetic energy
25 ?




Popular in General Chemistry I

Popular in Chemistry

This 2 page Class Notes was uploaded by nichl on Sunday September 25, 2016. The Class Notes belongs to 01:160:161 at Rutgers University taught by in Fall 2016. Since its upload, it has received 11 views. For similar materials see General Chemistry I in Chemistry at Rutgers University.


Reviews for Chemistry L5 - Photoelectric


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 09/25/16
GeneralChemistry Lecture 5 9/19/16 Photoelectric Effect  Refers tophenomenon inwhich electronsare emitted from surface of an atom when light strikes it  Characteristics o No electronsare emitted by a metal if the light isbelowa certain threshold frequency o Below the threshold frequency, no electronsare emitted regardlessof the intensity of light o If the frequency is greater than the threshold, then the greater the intensity of the light the more electrons that will be emitted  Kinetic energy increases as intensity increases above the threshold frequency  This increases the velocity of the electrons being “kicked off”  Minimum energy required to “kick off” electron (threshold frequency): o ????0???????? ???? ???????? ???? = ℎ???? wh0re ℎ = 6.62 ∗ −23(Planck’s Constant) &????0= threshold frequency o ????0???????? ???? ???????? ???? is the work function o The kinetic energyof an electron is ???????? = ℎ???? − ℎ???? ???? 0 o Ex:  The kinetic energyof an electron ejected from the surface ofa metal is 1.39∗ −19 10 J. Calculate the maximum wavelength of light needed toproduce this kinetic energy if threshold frequency is 1.83 ∗ S0−1.  ???????? = ℎ???? − ℎ???? 0  ???????? + ℎ???? =0ℎ????  (1.39 ∗ 10−19 )+ 6.626 ∗ 10 −34)(1.83∗ 10 4) = ℎ???? ℎ????  2.603 ∗ 10 −19= ℎ???? = ℎ???? ????  ???? = ℎ????  ???? = 7.63∗ 10 −7= 763nm Bohr’s Hydrogen Atom ????  ???? ???? − ????2  ???? = 2.18 ∗−18 J  ???? = 1,2,3… 1  When an electron is located infinitely far from thenucleu∞, ???? = 0 becau∞e2= 0 Line Spectra  ∆???? is energy change that accompanies leap of electron from one energy level to another in a Hydrogen atom 1 1  ∆???? = ????( 2− 2) ???????? ????????  If????????> ???? ,????electron absorbs a quantum of energy and moves away from thenucleus  If????????< ???? ,????electron releases a photon (quantum) of light and moves closer toward thenucleus  Transitions are equivalent to changes in energy level GeneralChemistry Lecture 5 9/19/16  In all transitions: o Electron makes leap from oneavailable level toanother – it never skipsbetween levels o Transitions that emit light produce spectral lines – emission spectra  Electron can only land in levelsthat are predetermined  ∆???? (change in energy) is also ℎ????  If E isnegative, energy isbeing emitted. If Eis positive, it is absorbing energy  Example: o If an electron fallsfrom n=6 ton=2, what wavelength of light is emitted by the electron? −18 1 1 o ∆???? = 2.18∗ 10 (????2− ????2) ???? ???? o ∆???? = 2.18∗ 10 −18 ( 1 − 1) = 4.84 ∗ 10−19 36 4 o ???? = ℎ???? ???? o ???? = 410 nm  Example: o A transition of electron that ends up at n=3 emits light ???? = 1095nm o What is theinitial level the electron begins on? 1. Find energy: a. ???? = ℎ???? = 1.814 ∗10 −19 J ???? 2. Find ∆????: −19 −18 1 1 a. −1.814 ∗10 = 2.18 ∗ 10 (????2− 3) 1 ???? b. 0.0279 = 2 ???????? c. ???? = 6 Transitions  Related to atomic spectroscopy –The emittance of light of a certain wavelength that shows up as a line on a spectrum Atomic Spectroscopy  Emission spectrum: Bright lines on a darkbackground  Each element has its own specific spectra (set of emission lines)  This is the basisof flame tests to identify ionic compounds Other Types of Spectrum  Absorption Spectrum: o Dark lines on a bright background o See Figure 3.11 pg. 74 & 3.13 pg. 75


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Jennifer McGill UCSF Med School

"Selling my MCAT study guides and notes has been a great source of side revenue while I'm in school. Some months I'm making over $500! Plus, it makes me happy knowing that I'm helping future med students with their MCAT."

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."


"Their 'Elite Notetakers' are making over $1,200/month in sales by creating high quality content that helps their classmates in a time of need."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.