Question

a scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. which of the following statements best describes what the scientist is observing?
the scientist is observing the electrical power of a superconductor.
the scientist is observing the temperature of a superconductor.
the scientist is observing an intensive property of a superconductor.
the scientist is observing an extensive property of a superconductor.

Explanation:

Intensive properties do not depend on the amount of substance. Electrical resistance becoming zero at low - temperatures in a superconductor is an inherent property of the material itself, not dependent on the quantity of the superconductor. Electrical power and temperature are not what's being described here. Extensive properties depend on the amount of substance, which is not the case for this observed property.

Answer:

The scientist is observing an intensive property of a superconductor.