Metals are known to have abundant free electrons. a metallurgical scientist wants to detect the presence of metals in a rock sample. which of the following best explains the type of detection instrument that the metallurgist should use?

an x-ray detector, because x-rays are produced due to high energy collision of electrons
an x-ray detector, because x-rays are emitted from the nucleus containing neutrons and protons
special cameras, because infrared rays are produced due to the interaction between free electrons
special cameras, because infrared rays are produced by very hot objects like metallic rocks

An x-ray detector, because x-rays are produced due to high energy collision of electrons

Explanation:

In order to check if metals are present in a given rock sample, different types of equipment are used. Example of such equipment is an x-ray detector. These x-rays are usually created when the direction of fast-moving electrons are changed as a result of their collision with a metal in a given rock sample.  Thus, the best type of equipment that the metallurgical student could use to check if metals are present in a given rock sample is the x-ray detector.

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definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.