Class notes
quantum physics notes
- Course
- Institution
Detailed quantum physics notes with definitions, text, images, and additional info from 9702 past papers I have completed from , all variants
[Show more]
Seller
Follow
advikasharma
Content preview
Quantum physics interference and diffraction provide evidence for the wave model
electromagnetic (EM) radiation is assumed to behave as a wave which is demonstrated by
the fact EM radiation exhibits diffraction and interference
However photoelectric effect and atomic line spectra can be explained if EM radiation
behaves as particles (particle model).
Photons
Definition: packet of energy of electromagnetic radiation
What this means is that energy is transferred as discrete packets of energy rather than
being transferred continuously
Photons are fundamental particles which make up all forms of electromagnetic radiation
E = hf (can also be written as E = hc/)
Where E = energy of photon (J)
h = Planck’s constant (6.63 x 10−34 )
f = frequency (Hz)
= wavelength (m)
c = speed of light (3 x 108 ¿
This equation tells us
E f (high frequency radiation means high frequency photons)
E 1/
Gamma photons (EM radiation from nuclei) are the most energetic
Electron volt
Used to express very small energies because quantum energies tend to be much smaller
than a joule
One electron volt (eV) is the energy gained by an electron travelling through a potential
difference of 1 volt
1 eV = 1.6 x 10−19 J
When a charged particle is accelerated through a p.d. , it gains K.E. which is given by
1 2
eV = mv
2
rearranging to find speed of electron gives √ 2 eV /m
(this equation applies to all charged particles)
E = VQ
Photoelectric effect
Definition: emission of electron from the surface of a conductor when electromagnetic
radiation is incident on it
The electrons removed in this manner are called photoelectrons
The photoelectric effect provides important evidence that light is carried in discrete
packets because each electron absorbs only 1 electron so only the frequencies of light
above a threshold frequency will emit a photoelectron.
Threshold frequency: minimum frequency required to release electron from the surface
of a metal
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller advikasharma. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $5.17. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
49497 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now