Aconcert loudspeaker suspended high off the ground emits 39 w of sound power. a small microphone with a 1.0 cm2 area is 60 m from the speaker. part a what is the sound intensity at the position of the microphone?

As we know that intensity of sound is defined as power received per unit area

so here the power of source is given as

distance of microphone is given as

now if loudspeaker is considered as spherical source then we will have

here

r = d = 60 m

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation:

the answer is 3.1 his answer is wrong mines is right