Physics
The wave theory of light can explain

Interference of light
Photoelectric effect
Comptom effect
Black body spectrum

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Physics
Purpose of an optical filter is to

Refract light of different colours
Transmit or absorb light of different colours
Dispense light into component colours
Reflect lights of different colours

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Physics
Conservation of energy refers to the fact that

No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
The entropy of the universe is always increasing

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