what experiment did robert millikan do?\na. he shot tiny positively charged particles through a thin gold…

what experiment did robert millikan do?\na. he shot tiny positively charged particles through a thin gold sheet.\nb. he first discovered electricity could flow through metal plates.\nc. he used voltage adjustments to make charged oil drops float.\nd. he measured how a cathode ray bent when it passed through charged plates.

what experiment did robert millikan do?\na. he shot tiny positively charged particles through a thin gold sheet.\nb. he first discovered electricity could flow through metal plates.\nc. he used voltage adjustments to make charged oil drops float.\nd. he measured how a cathode ray bent when it passed through charged plates.

Answer

Brief Explanations:

Robert Millikan is known for the oil - drop experiment. In this experiment, he used voltage adjustments to balance the gravitational and electrical forces on charged oil drops, allowing them to float. This enabled him to measure the elementary electric charge. Option A describes Rutherford's gold - foil experiment, option B is not related to Millikan's work, and option D is related to J. J. Thomson's work on cathode rays.

Answer:

C. He used voltage adjustments to make charged oil drops float.