Physics
The propagation of sound waves in a gas involves

Isothermal compression and rarefaction
Isochoric compression and rarefaction
Isobaric compression and rarefaction
Adiabatic compression and rarefaction

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Physics
What is the direction of torque?

Perpendicular to the direction of applied force
Parallel to the radius
Opposite to the direction of applied force
Same as the direction of applied force

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