More than sonic velocity

Less than sonic velocity

Equal to sonic velocity

none of the above

Ability to undergo large permanent deformation in compression

Ability to recover its original form

Ability to undergo large permanent deformations in tension

All of the above

<0.8%

<1.3%

>2%

>6.3%

Improve machinability

Improve ductility

Release internal stresses

Reduce hardness and brittleness

70% copper and 30% zinc

70% copper and 30%tin

30% copper and 70%tim

60% copper and 40% tin