Edexcel AS Physics Unit 2
Key words and features and stuff to try and make sense of edexcel attempt at a physics exam
Terms in this set (6)
A wave with no net transfer of energy that has a pattern of nodes and antinodes
Waves of constant phase relationship
Electrical energy transferred between two points. Measured in volts,
I = nqvA - What does each term stand for?
I = Current, A
n = No. of charge carriers per unit volume, m⁻³
q = Charge on charge carriers
v = Drift velocity of charge carriers, ms⁻¹
A = Cross sectional area of material, m²
Current through a conductor is proportional to the potential difference across it as long as the temperature of the conductor remains constant
How does the photoelectric effect support the particle theory of light?
-Increasing frequency increases KE of electrons, not no. of electrons (increasing frequency->increased energy of photon->increased energy of electron)
-One photon causes emission of one electron
-Release of electrons requires minimum energy, not accumulation- if exposed for long enough electrons should be emitted but this doesn't happen
-Energy of photons depends on hf
-More intense light=more photons, so more electrons emitted
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