Questions
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Answers
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What is the calculation of Wave Speed?
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wavelength x frequency
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What is the calculation of Speed?
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distance divided by time
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What is the calculation of Wave Period?
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1 divided by frequency
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What does a wave do?
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transports energy from one place to another
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Order EM waves from highest wavelength to lowest.
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radio and microwave and infrared and visible light and ultraviolet and x-ray and gamma ray
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What is the danger and use of Radio Waves?
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radio waves are safe and are used for communications and tv and radio
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What is the danger and use of Microwaves?
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microwaves burn if concentrated and are used for mobile phones and cooking
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What is the danger and use of Infrared?
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infrared burn if concentrated and are used for heating and cooking
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What is the danger and use of Visible Light?
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visible light can cause damage to eyes and are used for photography and illumination
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What is the danger and use of Ultraviolet?
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ultraviolet can cause sunburn or cancer and are used for security marking
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What is the danger and use of X-Ray?
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x-ray can cause cell destruction or cancer and are used for broken bones and security
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What is the danger and use of Gamma Ray?
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gamma ray can cause cell destruction or cancer and are used for detecting and killing cancer
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What is a transverse wave?
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vibration causing the wave at right angles to the direction of energy transfer
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What is a longitudinal wave?
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vibration causing the wave to be parallel to the direction of energy transfer
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What is Density?
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mass per volume
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What is the calculation of density?
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mass divided by volume
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What is Evaporation?
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liquid to gas
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What is Condensation?
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gas to liquid
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What is freezing?
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liquid to solid
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What is melting?
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solid to liquid
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What is specific latent heat of fusion?
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the energy required to change 1kg of substance from solid to liquid
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What is specific latent heat of vaporisation?
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the energy required to change 1kg of substance from liquid to gas
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What is the calculation of latent heat?
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energy divided by mass
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What is Internal Energy?
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the combined energy of kinetic and potential energy of the particles in a substance
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How do you increase Internal energy?
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heating the substance which will increase the particles kinetic energy and therefore the overall internal energy
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What is the calculation of change in thermal energy?
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mass x specific heat capacity x temperature change
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What is a force?
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a pull or push that is applied by an object on another
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What is the calculation of weight?
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mass x gravitational field strength
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Name 4 contact forces
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friction and air resistance and tension and reaction
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Name 3 non-contact forces
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gravitational and magnetic and electrostatic
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What are scalar quantities?
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has size and no direction
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What are vector quantities?
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has size and direction
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What are examples of scalar?
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speed and mass and distance and energy and time and power
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What are examples of vector?
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velocity and acceleration and force and weight and friction and air resistance
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What is resultant force?
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net or total force acting on an object
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What is the calculation of resultant force?
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mass x acceleration
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What is speed?
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how far something travels in a given time
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What is velocity?
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speed in a given direction
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What is the calculation of gradient?
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change in y divided by change in x
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What is the calculation of average speed?
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total distance divided by time taken
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What is the calculation of acceleration?
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change in velocity divided by time taken
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What is the calculation of stopping distance?
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thinking distance plus breaking distance
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Name factors affecting thinking distance.
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poor visibility and tiredness and too many drugs
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Name factors affecting breaking distance.
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icy/wet roads and driving too fast and tyres/breaks worn out
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What is the calculation of momentum?
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mass x velocity
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Name 6 energy stores
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kinetic and internal and electrical and magnetic and elastic potential and gravitational potential
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What is kinetic energy?
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depends on mass and speed of the object
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What is internal energy?
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contains thermal and chemical energy
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What is elastic potential energy?
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stretched or squashed materials keeping its shape
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What is gravitational potential energy?
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depends on mass and extra height and gravitational field strength
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What is electrical energy?
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carries electrical charges and exerts forces on each other
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What is magnetic energy?
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can be magnetised and exert forces on other magnetised forces
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Name 2 Renewable energy sources.
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nuclear power and solar power
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Name 2 Non-Renewable energy sources
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oil and coal
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What is wavelength?
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distance from one point on a wave to the same point of the next wave
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What is amplitude?
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the maximum disturbance from its rest position
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What is frequency?
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number of waves per second
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What is period?
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time taken to produce 1 complete wave
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What is a solid?
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regular pattern and fixed position and vibrates on spot and strong force
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What is a liquid?
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random arrangement and close and movement and weak force
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What is a gas?
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random arrangement and spread out and movement and very weak force
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