Photoelectric Effect, Work Function, Threshold Frequency, Wavelength, Speed & Kinetic Energy, Electr

This chemistry video tutorial explains how the photoelectric effect works. It also explains how to use the work function of metals to calculate the threshold frequency and maximum wavelength of light necessary to eject an electron off the surface of an active metal. In addition, it explains how to calculate the speed of an electron as well as the kinetic energy of an electron in electron volts. You need to know how to convert electron volts to joules and vice versa. This video provides all of the formulas and equations needed including plenty of practice problems and examples.
Speed of Light, Frequency, Wavelength:
• Speed of Light, Freque...
Photon Energy:
• How To Calculate The E...
The Photoelectric Effect:
• Photoelectric Effect, ...
De Broglie Wavelength:
• De Broglie Wavelength ...
The Bohr Model of Hydrogen:
• Bohr Model of the Hydr...
Heisenberg's Uncertainty Principle:
• Heisenberg's Uncertain...
________________________________
Intro to Quantum Numbers:
• Quantum Numbers
Orbitals & Atomic Energy Levels:
• Orbitals, Atomic Energ...
Maximum Number of Electrons:
• How To Determine The M...
Intro to Electron Configuration:
• Electron Configuration...
Electron Configuration Exceptions:
• Electron Configuration...
Noble Gas Notation:
• Electron Configuration...
Electron Configuration of Ions:
• Electron Configuration...
_______________________________
Orbital Diagrams:
• Orbital Diagrams and E...
Paired & Unpaired Electrons:
• How To Determine The N...
Aufbau's Principle & Hund's Rule:
• Aufbau's Principle, Hu...
Paramagnetic & Diamagnetic Elements:
• Paramagnetic & Diamagn...
Valence Electrons & Periodic Table:
• Valence Electrons and ...
Effective Nuclear Charge:
• How To Calculate The E...
_________________________________
Slater's Rule:
• How To Use Slater's Ru...
How To Identify The Element:
• Electron Configuration...
Quantum Numbers - Mega Review:
• Quantum Numbers - n, l...
Quantum Numbers - Practice Test:
• Orbitals, Quantum Numb...
Final Exams and Video Playlists:
www.video-tutor.net/
Full-Length Videos and Worksheets:
/ collections

[@TheOrganicChemistryTutor]

Final Exams and Video Playlists: www.video-tutor.net/

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[@mrsushi1192]

Nice video, but there’s one small part you missed out, so I hope this helps So basically if the frequency of the incident light is EQUAL to the threshold frequency, the electrons will get unbounded, but they won’t be ejected as there is no extra kinetic energy for the electrons to use to move out of the surface On the other hand, if the frequency is GREATER THAN the threshold frequency, then the electrons will get ejected, as the excess frequency will get converted into kinetic energy, and hence the electron can escape with any sort of velocity, depending on how much higher the frequency is. Hope this helps! :)

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If the frequency was exactly equal to the work function of metal will current flow then? Please explain this

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@@Paradox586 they get dislodged from the metal and rest on the surface

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Professor Organic Chemistry Tutor, this is an excellent explanation and analysis of Photoelectric Effect, Work Function, Threshold Frequency, Wavelength, Speed and Kinetic Energy in AP/General Chemistry. Once again, formulas are very important when breaking down and solving problems in Chemistry. The formula shows the relationship between all the great inventions in Chemistry. This is an error free video/lecture on KZbin TV with the Organic Chemistry Tutor.

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How can I find the velocity of the scattered electron given only the wavelengths of an X-ray before and after it scatters? I'm not given threshold frequency or work function.

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[@123pEpicGuy]

For question 2 when finding the maximum wavelength to liberate an electron. Wouldn't it have been easier to convert the eV to work. Then divide in by Planck's constant to get the threshold frequency (aka maximum frequency of light to liberate an electron). Then convert that frequency into a wavelength using the c=freqeucny x wavelength formula.I also then get 540nm.

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How do you find the work function and kinetic energy if you are given the frequency?

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[@user-zl6jx4gd1m]

Q7: The work function for sodium approximately If just onephoton of ultraviolet light of frequency 1015 Hz strikes the surface ofsodium (and does not merely bounce off). (a) What would be the maximumenergy of an ejected electron? (b) What would its speed be? (c) How wouldyour answer compare if 10 ^ 6 photons of the same frequency hit the sodium?

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Workout number. A metal of work function is 6.0ev is illuminated with light if the electron emitted have a maximum speed of 1x10 rise power 6m/s . Calculate the wavelength of light used.

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Hi, When an electron is knocked out of the atom, another will take it's place? If an inner shell electron is knocked out, then outer shell electrons will "relax" to replace it...Then will these relaxations not produce/emit light?. Tq

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how come? 425 nm becomes 4.25x10^-9 m if converted?

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How about binding energy

[@kenneth31251]

Intensity apparently only affects the amount of photons which doesn't increase the amount of electrons being ejected. Rather, a light with a higher frequency will have more energy in the photons which will cause it to eject more.

[@tomrp-yt2409]

In some way yes, however the electrons being emitted at a higher intensity, will be of much more frequent emission. So it doesnt exactly increase the maximum kinetic energy, however, it increases the frequency of which they are emitted. As one photon is absorbed by one electron. Hence, they came up with the wave particle duality.