Quantum physics

?
Which effect was only explained by light acting as a particle (photon)
Photoelectric effect
1 of 9
What is a photon?
A quantum (packet) of EM radiation. They are neutral and transfer either all or none of their energy when interacting with an other particle.
2 of 9
Energy carried by one wave packet?
E = hf = (hc)/wavelength
3 of 9
Define an electronvolt
The kinetic energy gained by an electron when it is accelerated through a potential difference of 1 volt
4 of 9
Explain the photoelectric effect
Free electrons on the surface of the metal absorb energy from the light. If electrons absorb enough energy, their bonds to the metal break - it's emitted from the surface. Emitted electrons are called photoelectrons
5 of 9
What is the frequency called that, for a radiation below this value, no photoelectrons are emitted?
Threshold frequency
6 of 9
What is the 'work function energy'?
the energy needed to break the bonds holding the electron to the surface of the metal
7 of 9
State an example of light as a wave and as a particle
Wave - Interference and diffraction. Particle - Photoelectric effect.
8 of 9
What was De Broglie's theory?
Wave-particle duality theory. 'If wave-like light showed particle properties, particles like electrons should be expected to show wave-like properties'
9 of 9

Other cards in this set

Card 2

Front

What is a photon?

Back

A quantum (packet) of EM radiation. They are neutral and transfer either all or none of their energy when interacting with an other particle.

Card 3

Front

Energy carried by one wave packet?

Back

Preview of the front of card 3

Card 4

Front

Define an electronvolt

Back

Preview of the front of card 4

Card 5

Front

Explain the photoelectric effect

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Quantum physics resources »