A hearing aid is essentially a system consisting of a tiny microphone, amplifier, and speaker. A particular hearing aid boosts the sound level by 33.0 dB. If a sound has a frequency of 100 Hz at an intensity of 3.10 ✕ 10−11 W/m2, what is the intensity (in W/m2) produced by the hearing aid? W/m2

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

hope this !

unlike poles attract