Physics
A photo-electric cell converts

Light energy to chemical energy
Mechanical energy to electric energy
Heat energy to mechanical energy
Light energy to electrical energy

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Interfacing synthesizer equipment.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing data in terms of measurable physical quantities.

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Egg absorbs salt from the solution and expands
Albumin dissolves in salt solution and egg becomes lighter
The density of salt solution exceeds the density of eggs
Water has high surface tension

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