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Physics
Summer Assessment (Paper Two)
Question | Answer |
---|---|
What equation links mass, velocity and momentum? | Momentum = mass x velocity |
What does the conservation of momentum principle state? | Total momentum before = total momentum afterwards |
What are the units for momentum? | Kg m/s |
What is the use of radio waves? | Communications (short-wave radio, long-wave radio) |
What are microwaves used for? | Satellite communication and heating food |
What is infrared radiation used for? | Heating and monitoring temperature |
What is visible light used for? | Photography |
What is ultraviolet used for? | Fluorescent lights (more efficient than filament light bulbs) |
What are X-Rays used for? | Let us see inside things |
What are gamma rays used for? | Sterilising food and medical equipment |
_________ frequency radiation is usually more dangerous | Higher |
What is the danger of microwaves? | Heating human body tissue |
What is the danger of infrared waves? | Skin burns |
What is the danger of ultraviolet rays? | Damage surface cells and cause blindness. Can also cause cell mutation or destruction |
What is the danger of gamma rays? | Can cause cell mutation or destruction, leading to tissue damage or cancer |
Moment = ? | Force x perpendicular distance |
Conductors conduct charge, _____________ don’t | Insulators |
How does an inkjet printer work? | 1. Drops of ink forced out of fine nozzle with a charge 2. Two oppositely charged metal plates either attract or repel ink drops 3. The size and direction of the voltage on each plate changes so the ink hits different places |
How does a photocopier work? | 1. Image is projected onto positively charged image plate 2. Whiter bits of whats being copied make light fall onto the plate and charge leaks away from those places 3. Charged bits attract negatively charged black powder 4. Image heated, powder stick |
Orbital speed = ? | 2 x pi x orbital radius/time period |