Which property of argon makes it useful for potassium-argon dating? It decays into potassium.

It is an unstable element.

It remains trapped in rock.

It is useful only for dating newer rock.

Please help 100 points

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

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