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34 Cards in this Set
- Front
- Back
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What is the difference between speed and velocity? |
Speed is just a number, but velocity describes both speed and direction |
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The path of a projectile is always a what? |
Parabola |
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What is the path of a projectile called? |
Trajectory |
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What things may change the pressure of a gas? |
A decrease in volume gives an increase in pressure Increasing the temperature, increases the pressure |
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What can affect momentum? |
Colliding particles |
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What force does gravity provide? |
Centripetal force |
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Why do satellites stay over the same point on earth? |
They are high in orbit and orbit once every 24 hours, which means they stay above the same point, as the earth rotates with them |
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What are geostationary satellites used for? |
Telephone, TV and radio |
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How is a low polar orbit satellite different to a geostationary one? |
Low polar orbits, pass over both poles, low, while the earth rotates beneath it. They move faster because the gravitational pull is stronger |
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What are low polar orbit satellites used for? |
Spying and weather forecasting |
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What are microwaves used for? |
Satellite communications |
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What are some qualities of microwaves? |
Pass easily through the atmosphere to satellites |
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What are waves of a) below 30 MHz b) between 30MHz and 30GHz c) above 30GHz used for? |
A) radio waves are reflected off the ionosphere B) radio waves and microwaves pass straight through the atmosphere C) rain and dust scatter microwaves, reducing their strength |
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What do long wavelength radio waves do? |
Diffract |
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What would make a wave diffract more than others? |
A small gap - wave diffracts more |
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What happens when 2 waves of the same direction 'disturb' each other? |
Constructive interference |
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What happens when two waves of opposite directions collide? |
Destructive interference |
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What happens when 2 speakers play the same note at the same time? |
At certain points sound waves will be in phase, meaning you'll get constructive interference and the sound will be loud. At certain points the sound waves will be out of phase, meaning you'll get destructive interference and there will be virtually no sound, this is because the waves cancel each other out. |
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What evidence is there for light behaving like a particle or a wave? |
Particle - reflection and refraction Wave - diffraction and interference |
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What is a polarising filter? |
Something that only lets through vibrations in one particular direction |
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What is relative speed? |
It compares the speeds of 2 different objects! |
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What is the relative speed of 2 cars going the same direction? |
You minus the 2 speeds |
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What is the relative speed of 2 cars going the same direction? |
You minus the 2 speeds |
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What's the relative speed of cars going In an opposing direction? |
You add the speeds |
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What happens when white light enters a prism? |
The light will split up into different colours because each colour is refracted at different speeds in different mediums - dispersion |
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What happens when white light enters a prism? |
The light will split up into different colours because each colour is refracted at different speeds in different mediums - dispersion |
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What colour of light is refracted the most / least when it travels from air to glass? |
Red is refracted least because it is slowed down least Blue is refracted most because it slows down the most |
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Convex lenses create ..... |
Magnified images |
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Convex lenses create ..... |
Magnified images |
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Cameras make the image ....... |
Smaller than the object |
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Convex lenses create ..... |
Magnified images |
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Cameras make the image ....... |
Smaller than the object |
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Projectors make the image ...... |
Larger than the object |
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Magnification = |
Image size / object size |
