How do tidal power plants generate electricity? A barrage allows water to flow during high and low tide, this turn's the plant's turbines. A barrage holds back water during high tide. The force of the water against the barrage turns the plant's turbines. A barrage store water during high and low tide. When the water is released, it turns the plant's turbines. A barrage stops water from flowing out at low tide, creating a force that turns the plant's turbines.

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c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.