Paper Flashcards
What happened to the wasted energy?
Transferred into surroundings/ atmosphere
As the motorbike moves towards the microphone the frequency of the sound wave detected by the microphone will be _________ the frequency of the sound wave produced by the motorbike.
Higher than
The war length of the sound wave detected by the microphone will be ______ the wavelength of the sound wave from the motorbike,
Shorter than
Finish this paragraph…
The car’s motor transfer ………. energy into useful ……… energy as the car moves. Some energy is wasted as ………. energy
Electrical
Kinetic
Sound
An advantage for using nuclear power stations rather that gas fired power stations to generate electricity
Produced little carbon dioxide
A disadvantage of using nuclear power stations over gas fired power stations
Waste is toxic
Why on average do wind turbines operate at maximum power output for only 30% of the time?
Wind can be unreliable
Give one advantage of using underground power cables rather than overhead power cables
No hazard to low flying aircraft
Which type of electromagnetic radiation makes the biscuits turn brown?
Infrared
Suggest two ways of cooking biscuits in this over to make them turn Browner
Increase power
Decrease speed
The inside and outside surfaces of the oven are light coloured and shiney. Explain why?
The inside surface is a good reflector, the outside surface is a poor emitter so it reduces energy loss
What does a frequency of 400 Hz mean?
400 sound waves produced in one second
It is better for the environment If people switch off their televisions, instead of leaving them in ‘stand by’ mode
Explain why
TV in stand by uses electricity, generating electricity produced CO2 which contributes to global warming
The air inside the fridge forms a convection current when the fridge door is closed why?
Cool air is more dense
