An electron makes a transition from a certain energy level Ek to the ground state E0. If the frequency of emission is 8.0 x 1014Hz The energy emitted is
Given that Young's modulus for aluminium is 7.0 x 10\(^{10}Nm^{-2}\) and density is 2.7 x 10\(^3\)kgm\(^{-3}\), find the speed of the sound produced if a solid bar is struck at one end with a hammer