Lakhmir Singh Chemistry Class 10 Solutions Page No:185 Solution 1 Yes, sound can travel through iron and as well as water. Solution 2 No, sound cannot travel through vacuum. Solution 3 Radio waves are used to communicate with one another on moon. Solution 4 Solid – table Liquid – water Gas – air Solution 5 Vacuum Solution 6 Frequency Solution 7 SI unit of frequency is hertz. Solution