Definitions and Facts

Question 1

Fission

Answer 1

Splitting a large, unstable nucleus

• nucleus absorbs a neutron before splitting
• 2 or 3 neutrons are released along with 2 new lighter elements roughly the same size

Question 2

Fusion

Answer 2

The joining of smaller nuclei

• collide at high speed and fuse forming larger heavier nuclei
• lots of energy is released
• high temperatures and pressures are required

Question 3

Current

Answer 3

• The flow of electric charge
• Series: same current everywhere
• Parallel: splits
• > Resistance =

Question 4

Thermistor

Answer 4

Symbol: Box with horizontal line through it

-As temp. increases, resistance decreases

Question 5

LDR’s

Answer 5

Light Dependent Resistors
Symbol: A box with a ring around it
-As the light intensity increases, resistance decreases

Question 6

Specific Heat Capacity Experiment

Answer 6

1) A box with two holes in it for a thermometer and heater
2) Measure the mass of it then wrap an insulating material around it (to reduce energy transfer to the surroundings)
3) Put the thermometer and heater in
4) measure the initial temp and set power supply to 10V and start stopwatch
5) As the block heats up, measure the temp every min and watch the ammeter; the current shouldn’t change
6) Collect 10 readings then turn off the power supply
7) Use the data to find the SHC

Question 7

Nuclear Model of the Atom

Answer 7

• Arranged in energy levels (shells)
• Nucleus = Protons + Neutrons
• Shells = Electrons

Question 8

Isotope

Answer 8

A variation of the same element with the same number or protons and electrons but a different number of neutrons

Question 9

Pressure

Answer 9

If the volume of a fixed mass of gas is reduced, then the pressure increases; there is less space for the particles to move about in.