Eels are examples of a. jawless fish b. reptiles c. cartilaginous fish d. bony fish

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Photons with the highest energy have the longest period