What type of radiation is lead emitting in the following equation?

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?