Why do protons repel protons but attract electrons ? ?

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

This is the number of complete movements of a wave per second.

Which of the following list the divisions of the geologic time scale in order from longest to shortest