Physics
Analog synthesis refers to a technology based on

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

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The sea is wider than the river

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