Give reason: A sound wave is called a longitudinal wave.
b. A sound absorbing materials are kept in walls of cinema hall.
An echo is not heard in a small room.
d. A reverberation does not occur in furnished rooms,​

this is a good question! i'll do some research and come back when i have the answer!

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force