Aconcert loudspeaker suspended high off the ground emits 25.0 w of sound power. a small microphone with a 0.500 cm^2 area is 55.0 m from the speaker. a. what is the sound intensity at the position of the microphone? express your answer with the appropriate units.
b. how much sound energy impinges on the microphone each second? express your answer with the appropriate units.

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Which statement correctly describes the relationship between frequency and wavelength?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.