Need answer asap: 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? a.) an x-ray detector, because x-rays are produced due to high energy collision of electrons b.) an x-ray detector, because x-rays are emitted from the nucleus containing neutrons and protons c.) special cameras, because infrared rays are produced due to the interaction between free electrons d.) special cameras, because infrared rays are produced by very hot objects like metallic rocks