A water wave of frequency 20hz has a velocity Of 24ms¹ it enters the shallow region at an angle of incident of 45 and speed recluces to 18ms² calculate (A) Refractive index (b)Angle of refraction (c) wave length of water wave in the shallow region. .

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