Can anyone me what to derive formula until we finally obtained the formula of interference of sound wave which is , lambda = ax/d, a= distance between two speakers, x= distance between two consecutive loud sound, d = distance between the straight line path amd the two speakers

What are the theoretical properties of a gas at a temperature of 0 kelvin?

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg