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56 Cards in this Set
- Front
- Back
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What is the difference between analogue and digital? |
Analogue can be a range of signals whereas digital is 1's and 0's |
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What type of wave transfers digital signals from mobile phones to masts and satelites? |
Micro waves |
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Why are digital signals better for sending information over long distances? |
Noise and interfearance isn't a problem for digital. |
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What is sampling (digital and analogue) |
How we convert analogue to digital sounds. |
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What does being efficient mean? |
Not wasting time or effort. How good something is at changing energy to one form or another. The more efficient something is the less energy is wasted. |
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Energy efficiency = |
Useful output energy ------------------------------ Total input energy |
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What does LDR stand for? |
Light Dependent Resistor |
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What does a LDR do? |
The resistance decreases as the light intensity shining on it increase (becomes brighter) |
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How does an endascope work? |
They take advantage of a property light. If light hits a surface above a certain angle (critical angle) it will reflect (total internal reflection) |
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What is ultra sound and what is it used for? |
It uses sound waves that are too high for humans to hear. It can show structures and movement. It is used to see unborn babies, the heart, blood vessels, and other organs. |
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What is MRI and what is it used for? |
MRI - Magnetic Resonance Imaging MRI scanner uses a strong magntic field and radio waves to see organs and structures in patients. It is used to investigate the brain, bones, breasts, and organs like the heart, liver, and lungs. |
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We hat is an endasope and what is it used for? |
It has a long flexible tube that contains optical fibers. Light travels from one end to the other using total internal reflection. It can be passed through the mouth into the stomach, through the nose into the lungs, or through the anus into the large bowel. |
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What is a x-ray and what is it used for? |
Shows organs and bones. Often used to see cracks in bones. Bones absorb more of the x-rays than soft tissue. |
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Renewable energy |
Solar Wind Sunlight Hydro-electric Tidal Wave Biofuel Geothermal |
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Non-renewable energy |
Coal Oil Gas Nuclear |
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What is the big bang? |
The big bang is when there was an explosion that created the whole universe. The universe is still expanding after exploding suddenly in a big bang from a very small initial point. Space, time, and matter we're created in the big bang. |
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What did people first think about the solar system? |
They thought Earth was the center of the solar system - geocentric |
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What did Copernicus think the model of the solar system is? |
The sun in the center - heliocentric |
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What did mars appear to do? |
Move backwards and forwards across the sky - retrograde motion |
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What did Galileo invent? |
Telescope |
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What did Galileo see that proved Copernicus right? |
Jupiter had 4 moons |
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What are light-dependant resistors used for in hospitals? |
To detect changes in light level. |
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What are sensors emitting visible light and infrared radiation used for in hospitals? |
To detedct blood oxygen levels. |
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What are electrodes used for in hospitals? |
To moniter electrical changes in the heart. |
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What are thermistors used for in hospitals? |
To detect changes in temperature. |
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What is a sensor? |
Something that detects change. |
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What is beta radiation used for? |
To control the thickness of paper. |
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What is alpha radiation used for? |
Can protect skin. |
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What are the industrial uses of radiation? |
Radiation trackers. |
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What is the most dangerous inside your body? (Alpha, beta, and gamma) |
Alpha |
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What can radiation do to the body? |
Harm, mutate, or kill. |
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What is the most dangerous outside of the body? (Alpha, beta, gamma) |
Gamma |
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What are the medical uses of radiation? |
Can be used to treat cancer. |
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What is gamma radiation used for? |
See inside the body. |
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Geocentric |
Earth at the center |
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Heliocentric |
Sun at the center |
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Satelites |
Anything that orbits/circles something else. |
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Which part of Earth does a geostationary orbit pass over? |
1 point/a fixed point. |
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What part of Earth does a low polar orbit pass over? |
Poles |
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What part of Earth does a low earth orbit pass over? |
Any |
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How long does a geostationary orbit take to complete the orbit? |
24 hours |
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How long does a low polar orbit take to complete a orbit? |
Less than a day |
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How long does a low earth orbit take to complete a orbit? |
Less than a day (90 min) |
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What is alpha made of? |
2 protons + 2 neutrons |
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Where is alpha from? |
The nucleus |
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What is beta made of? |
Electrons (negatives) |
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Where is beta from? |
The nucleus |
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What is radioactive decay? |
When a radioactive atom gives out particles and/or energy from it's nucleus, it turns into another atom. |
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We hat is a half-life? |
The amount of time it takes for 1/2 atoms in a sample to decay. |
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What is electro magnetic induction? |
When yoh make electricity happen. |
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What does SETI stand for? |
Search for Extra Terrestrial Intelligence |
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What does METI stand for? |
Messaging Extra Terrestrial Intelligence |
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What is the Goldilocks zone? |
A zone where it is not too hot or too cold for liquid water. An area where planets supposedly need to be for life to exsist. Aka The habitable zone. |
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What is an exoplanet? |
A planet that orbits a star other than the sun. |
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What is reflection? |
Light bouncing back from a surface. |
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What is refraction? |
The change of direction light makes as it passes from one medium to another. |
