Gold-184 and gold-186are different blank of gold​

Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves

Who was the first scientist to measure speed as distance over time?

What is a subatomic particle with a negative charge and very little mass?