Motion and Forces
Energy
Waves and EM
Radiation
100
How far has a student travelled if their speed changed from 10m/s to 20m/s at an acceleration of 3 m/s2? (include units)
x = (v^2-u^2)/(2*a)
50 m
100
List 5 different energy stores
Nuclear, Tension, thermal, chemical, gravitational, kinetic
100
Order the wavelengths from shortest wavelength to longest.
Visible light, microwave, x-ray, ultraviolet, infrared, gamma, radio
gamma, x-ray, UV, visible, IR, micro, radio
100
List 2 sources of background radiation and the instrument we use to detect them
Geiger-muller tube
Any from: rocks, Sun, buildings, food, nuclear waste, power stations medical, water, radon, cosmic rays
200
If a student is walking around in a circle at a constant pace, what happens to their speed and velocity?
Their speed stays the same while their velocity constantly changes.
200
State the energy stores and transfers involved in turning on an electric fan.
chemical > electric > kinetic (Also thermal and sound)
200
State a use and a danger of gamma rays.
Used in medicine/sterilizing.
Can cause death or cancer.
200
How does an atom release light waves?
Electrons are excited to higher shells. When they return to their normal orbit, they release EM waves.
300
Which of the following graphs represents a car travelling on a motorway with cruise control on.
top middle or bottom right
300
Use the Sankey diagram to describe why the CFL has a higher energy rating. Be specific.
4 times as much usable energy.
300
The distance between the Earth and Sun is 1.5x1011m.
Light takes 500 s to travel from the Sun to the Earth
The wavelength of red light is 670 nm.
Calculate the frequency of red light.
4.5x1014 Hz
300
Fill in the blanks
99, 43
400
An ice skater pushes harder with his leg muscle, then he begins to move faster. Which law? and why?
2nd, because an increase in force increases acceleration
400
Explain why an insulated thermos can both keep cold drinks cold and hot drinks hot.
Creates a system which minimizes heat transfer (either way)
400
Explain how a radiowave is created
Oscillation of electrons in a wire produces radiowaves
400
What is the structure of an alpha particle?
Helium nucleus. 2 protons and 2 neutrons
500
What is meant by the term 'inelastic collision' in terms of energy and momentum?
KE is lost, momentum is conserved.
500
Calculate the height of a ball if it is has a velocity of 10 m/s just before impact.
G= 10m/s2
KE=1/2mv2
GPE=mgh
5 m
500
When white light crosses the boundary between air and glass, it can split into the colours of the spectrum. Explain, in terms of speed, why the light behaves like this.
Colours have different wavelengths. Different wavelengths travel at different speeds and so refract by different amounts.
500
Carbon-14 is a radioactive isotope with a half-life of 5700 years. The number of C-14 atoms in a piece of wood is found to have decreased from 1'000'000 to 125'000. Determine the age of the wood.
17100 years