Topic 5 - Waves (Physics A level Edexcel)

What is the photoelectric effect?

• Where a current is produced in a diode

• When a wire is passed through a magnetic field, inducing a current

• When electrons get released from an atom (ionisation) because of an EM wave

• The process of using electronics to take digital representations of an image

What are photons?

• Bundles or quanta of energy

• A fundemental particle on the standard model

• Light being interpreted in wave form

What is the photoelectric effect phenominon?

• Where particles ionised when light shone on them

• Where particles only ionised when the light shone on them was higher than a certain frequency

• The photoelectric effect

• That different light is emitted when electrons drop down energy levels

What is the particle theory?

• That only Photon particles can release electrons

• That light causes the emission of particles (Photoelectric effect)

• That everything is made up of tiny particles called atoms

• That light can also act as particles

What is wave particle duality?

• a law that says Photons are particles

• Light is just a wave

• every particle can be described as a particle, or a wave

• That light is both a wave and a particle

What is Threshold Frequency?

• Minimum frequency of wave to ionise an electron

• Maximum frequency of wave to ionise an electon

• Maximum frequency of wave to stop the ionisation of electrons

• Minimum frequency of wave to stop the ionisation of electrons

What is work function?

• The energy required for an atom to escape from a composite

• The energy of a certain frequency of light (e=hf)

• The energy of an ionised electron

• The minimum energy required for an electron to ionise

What is Einstien's equation for the photoelectric effect?

• e = hf

• e = mc^2

• hf = ϕ + 1/2mv^2

What is ϕ?

• Energy of an emitted electron (Einstien's equation)

• Work Function

• Threshold Frequency

• The product of

  hf - 1/2mv^2

What is the rule about Photons and Electrons?

• Photons cannot release electrons because they have wave properties

• An electron's KE after ionisation is equal to the Photon's KE before

• A Photon is released when an electron is ionised

• One Photon releases one Electron