# Physics Unit 2

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What is meant by root mean square voltage?
the square root of the mean of the squares of all the values of the voltage in one cycle
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How will current change with extra apparatus in a series circuit?
voltage of supply now shared by lamps so resistance increases = current reduced
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How will current change with extra apparatus in a parallel circuit
current through lamps unchanged as they are both connected directly to the supply
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Why does threshold frequency give evidence for light being a particle?
below threshold frequency no electrons given off even when intensity is increased; energy of a photon less than work function; light travels as photons; lack of time delay; photon energy depends on frequency
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## Other cards in this set

### Card 2

#### Front

How will current change with extra apparatus in a series circuit?

#### Back

voltage of supply now shared by lamps so resistance increases = current reduced

### Card 3

#### Front

How will current change with extra apparatus in a parallel circuit

### Card 4

#### Front

Why does threshold frequency give evidence for light being a particle?

g