Suppose that the sound level of a conversation is initially at an angry 71 db and then drops to a soothing 54 db. assuming that the frequency of the sound is 504 hz, determine the (a) initial and (b) final sound intensities and the (c) initial and (d) final sound wave amplitudes. assume the speed of sound is 343 m/s and the air density is 1.21 kg/m3.

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light