A standing wave has a fundamental frequency of 15 Hz. What is the frequency of the 3rd harmonic

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

What would be the net charge of 1 gram gold piece after removal of 1% of its electrons

By definition a socially healthy person has access to clean water in adequate living space and makes an effort to recycle