Physics 2 Flashcards
What are the advantages of photocells?
Robust, don’t need maintenance
Don’t need fuel and long power cables
No pollution or no contributing to global warning
How do you get energy from the wind?
We use wind turbines. If there is no wind, they do not work
How do solar reflections work?
The move via computer to make sure they are always facing the sun
What is the greenhouse effect?
Radiation is absorbed by and warms the earth. The earth then re-radiates the energy. This then warns the atmosphere causing global warming
When is energy cheaper?
Energy is cheapen at night because it isn’t needed as much, but it still needs to be produced.
How do people choose what energy to use?
Availability
Ease of extraction
Effect on he environment
Associated risks
What is the national grid?
The national grid is a series of transformers and power lines that transport electricity from the power stations to the consumer
What are atoms that contain the same number of protons and neutrons called?
They are neutral
What does ionisation involve?
Gaining or loosing electrons.
When the atom gains electrons, it become negatively charged
When the atom looses electrons, it become positively charged
What are the three main types of radiations from the nucleus of an atom?
Alpha
Beta
Gamma
Give an advantage of nuclear power.
Fossil fuel reserves are not used
No greenhouse gases are let off into the atmosphere
Give a disadvantage of using nuclear power.
High maintenance
Decommissioning costs
Risk of accidents
Name (in order) the planets in the solar system.
Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune Pluto
Where can unmanned probes go?
Places that are deadly for humans
How fast does light travel?
300,000 km/s
