Practice Questions
1.State the definition of velocity
Velocity is the speed of an object in a given direction.
2. Describe how speed and velocity are different.
Speed is a scalar quantity, so it has a magnitude (size)only. Velocity is a vector quantity so it has both a magnitude and direction.
3. Marie is on a big wheel fairground ride travelling at 4m/s. Explain why she can have a constant speed of 4m/s, but her velocity would be constantly changing.
On a big wheel ride, the rider will move in a circular path. So, speed can be constant because it does not depend on direction. Velocity however, depends on both magnitude and direction. On a circular path the direction will constantly change, so therefore velocity will constantly be changing.
Absorption and Emission of EM Radiation
JJ Thomson and Plum pudding model
Ernest Rutherford and the Nuclear Model
Niels Bohr changing the Nuclear Model
Discovering the Proton and Neutron
Measuring radiation from radioactivity
Radiation types and properties
Random nature of radioactive decay
Radioactive contamination or irradiation
Hazards of contamination and irradiation
Studies on the effects of radiation on humans
Different half lives of radioactive isotopes
Nuclear Fission Chain Reaction
Writing nuclear fission equations
Drawing ray diagrams for a concave lens
Drawing Ray Diagram to produce a virtual image for a convex lens
Drawing ray diagram to produce a real image for a convex lens.
Specular and Diffuse Reflection
Seeing Coloured Objects Part 2
Viewing objects through coloured filters
Transparent, Translucent and Opaque