Question number 23 and 24 in the picture please explain about the question very clearly and answer fast as possible

Question number 23 and 24 in the picture please explain about the question very clearly and answer fast as possible 22. 23 4 COMPENDIUM-1718.CRP & ISP NSEJS-C1ass VIII.PH-29 In case Of reflection of sound waves (A) angle Of incidence has no relationship with the angle of reflection (B) angle of incidence = angle of reflection (C) angle of incidence < angle of reflection (D) angle of incidence > angle of reflection Two bobs Of masses I kg and 2 kg are suspended from a rigid support by threads of lengths 4 m and 1 m respectively. The ratio of their time periods is A simple pendulum has a time period of 1.0 sec at the earth's surface. It is taken to a height RJ2 above the earfr's surface, is the radius of the earfi. The time period is (A) 1.5 sec. (C) 3.25 sec. (B) 2.5 sec. (D) none of these.