9. Taking the density of nitrogen at STP to 1.251 kgm-3, find the root mean square velocity of nitrogen molecules at 127°C. 2067 S
(Ans: 597 m/s)​

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