AQA AS PHYSICS QUANTUM PHENOMONA LATEST UPDATE
What is the photoelectric effect?
Emission of electrons from a surface when a surface is illuminated by light of a frequency greater than the minimum value known as the threshold frequency.
Photoelectric emission does not take place if _______...
What is the photoelectric effect?
Emission of electrons from a surface when a surface is illuminated by light of a
frequency greater than the minimum value known as the threshold frequency.
Photoelectric emission does not take place if ___________________
the frequency of the incident electromagnetic radiation is below a certain value known
as the threshold frequency.
The number of electrons emitted is ____________
proportional to the intensity of the incident radiation, provided the frequency is greater
than the threshold frequency.
Photoelectric emission occurs without delay as soon as _______
incident radiation is directed at the surface, provided the frequency of radiation exceeds
the threshold frequency.
When light is incident on a metal surface _____________
An electron at the surface absorbs a single photon from the incident light and therefore
gains energy equal to hf.
An electron can leave the metal surface if _____________
The energy gained from a photon exceeds the work function of the metal.
Define work function.
minimum energy needed by an electron to escape from the metal surface.
Excess energy gained by an electron beccomes _______________
Its kinetic energy.
Emission can take place from a metal surface provided ________________
Ekmax>0 or hf>0
Electrons that escape from the metal plate can be attracted back to it by
______________
giving the plate a sufficient positive charge.
What is the stopping potential?
The minimum potential needed to stop photoelectric emission.
At stopping potential, the maximum kinetic energy is ________________
reduced to zero because each electron must do extra work equal to e x Vs
When a conduction electron absorbs a photon ______________
its kinetic energy increases by an amount equal to the energy of a photon.
If the energy of the photon exceeds the work function of the metal ____________
The conduction electron can leave the metal.
If the electron does not leave the metal ______________
it repeatedly collides with other electrons and positive ions and it quickly loses its kinetic
energy.
When light of a frequency greater than the threshold frequency for the metal is
directed at the photocathode ______________
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 SUPERGRADES01. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.09. You're not tied to anything after your purchase.
