6. Exam Questions: Edexcel A Level

6.6. Sound travels by means of longitudinal waves in air and solids. A progressive sound wave ofwavelength and frequency f passes through a solid from left to right. The diagram × belowrepresents the equilibrium position of a line of atoms in the solid.Diagram Y represents the positions of the same atoms at a time t = t 0 .XYt oZ t = t + T o4Explain why the wave is longitudinal.............................................................................................................................................................................................................................................................................................(1)On diagram Y label(i)(ii)(iii)two compressions (C),two rare factions (R),the wavelength of the wave.(3)The period of the wave is T. Give a relationship between , T and the speed of the wave inthe solid.............................................................................................................................................................................................................................................................................................(1)Along the line Z mark in the positions of the two compressions and the two rare factions at atime t given by t = t 0 + T/4.(2)(Total 7 marks))Total /50- 24 -