Can non conductor be called an insulator​

Distinguish between a transverse wave and a longitudinal wave.

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up