In general, if a sound has intensity of β db at 1 m from the source, at what distance from the source would the decibel level decrease to 0 db? since the limit of hearing is 1 db this would mean you could no longer hear it. express the answer in terms of β. possibly relevant information: the sound of normal breathing is not very loud, with an intensity of about 11 db at a distance of 1 m away from the face of the breather. again: express the answer in terms of β!

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?