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Description
Flashcards by Catherine Gannon, updated more than 1 year ago
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Created by Catherine Gannon
over 6 years ago
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| Question | Answer |
| Give me the equation for efficiency | Efficiency = Useful output energy transfer ÷ Total input energy transfer |
| Give the word equation for potential difference | Potential difference = Current x Resistance |
| Give the symbol equation for potential difference | V = A x Ω |
| What does an Ammeter do? | Measures the current in Amps flowing through the test wire |
| What does a Voltmeter do? | Measures across the TEST wire in volts |
| Describe J.J Thomson's Plum Pudding Model | Thomson thought atoms were spheres of positive charge with negative electrons stuck in it- like a plum pudding |
| Describe the experiment that leads to the Nuclear model of the atom | -Scientists fired alpha particles at gold foil -They expected the alpha particles to go straight through the sheet -Some particles deflected, means the nucleus must have a positive charge -Most alpha particles went through, meaning the nucleus is mostly empty space |
| What is the half-life? | The amount of time taken for the number of radioactive nuclei in an isotope to halve |
| What does a short half life mean? | The source is dangerous and emits a large amount of radiation at the start, but quickly becomes safe |
| What does a long half-life mean? | Source releases small amounts of radiation over a long period of time |
| What is a vector? |
A quantity that has direction AND magnitude
Image:
Oh Yeah (image/png)
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| Name FIVE vector quantities | Force, velocity, displacement, acceleration and momentum |
| Name FIVE scalar quantities | Speed, distance, mass, temperature and time |
| How do you calculate Weight? | Weight = Mass x Gravitational Field Strength |
| What is a moment? | The turning effect of a force |
| What is the equation for the size of the moment? | Moment = Force x Distance |
| What is the equation for pressure? | Pressure = Force/Area of surface |
| What's the equation for pressure at a DEPTH? | Pressure = Height of liquid container x Gravitational field strength x density |
| When will an object float? | If it's weight is equal to the upthrust |
| What is the equation for acceleration? | Acceleration = Change in velocity/Time |
| What is the equation for CONSTANT acceleration? | Final velocity^2 - Initial velocity ^2 = 2 x acceleration x distance |
| What is the equation for stopping distance? | Stopping distance = Thinking Distance + Breaking Distance (Stop, Break and Think) |
| Give me the equation for momentum | momentum = mass x velocity |
| Describe a transverse wave | Oscillations are perpendicular (90 degrees) to the direction of energy transfer |
| Name three transverse waves | EM waves, ripples and waves in water, wave on a string |
| Describe longitudinal waves | Parallel oscillations to the direction of energy transfer |
| Name two longitudinal waves | -Sound waves, ultrasound -Seismic waves |
| How do you calculate wavespeed? | Wave speed = Frequency x Wavelength |
| What is a specular reflection? | When a wave is reflected in a single direction |
| What is a diffuse reflection? | When a wave is reflected on a rough surface and the waves are scattered in different directions |
| Name the EM spectrum from the largest wavelengths to the smallest | Radio Waves, Micro Waves, Infra Red, Visible Light, UV, X- Rays, Gamma Rays (Raging Martians Invade Venus Using X-ray Guns) |
| What are radio waves used for? | Communication in long-wave radio and Bluetooth |
| Give two uses of microwaves | Satellites in space and microwave ovens |
| What can infrared be used for? | To increase or monitor temperature |
| What is a perfect black body? | An object that absorbs all of the radiation that hits it |
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