America
Africa
Europe
Oceania?
Asia
100
What is the half-life?
6 hours
100
What is the half-life?
10 years
100
What is the half life?
2 days
100
5730 years
100
How many half-lives must pass to get to 12.5%?
3
200
What symbol?
LED
200
What does this change in a circuit?
Resistance
200
How is the ammeter connected here?
In series
200
How would you get the readings for the negative potential difference?
Turn the battery round
200
Which state of matter has the most particles in a certain volume?
Solid
300
How do the particles move in a solid?
Vibrate in a fixed position
300
Which energy store will decrease?
Which energy stores will increase?
Gravitational potential will decrease
Kinetic and elastic will increase
300
Which of these shows a directly proportional relationship?
Ohmic conductor
300
What happens to the resistance of the bulb as the potential difference across it increases?
It increases
300
What happens to the rate of increase of power when the bulb gets hot?
It decreases P = VI
400
How many neutrons does sodium have?
12
400
Why were the alpha particles repelled from the nucleus?
They have the same positive charge
400
Only 1 in 10 000 alpha particles were reflected back. What does this tell us about the size of the nucleus?
Very small with most of the atom being empty space
400
Which model of the atom came second after the discovery of the electron?
Plum pudding
400
In which decade was the neutron discovered?
30s
500
Bo
Bohr model or nuclear model?
Nuclear
500
Are the electrons in these sodium atoms moving up or moving down an energy level?
Moving down and releasing electromagnetic energy (light)
500
Which switch/switches need to be closed for the light to be on?
S1 or S2
500
What happens to the current in this circuit when the variable resistor's resistance is increased?
It decreases
500
What happens to the potential difference across the resistor when th resistance of the variable resistor is decreased?
It increased (gets a larger share)