You attend a concert and have a seat that is 70 m away from the stage where the sound is produced. How long does it take for the sound to reach your ears? You take a picture with your phone and send it to your friend who could not come to the concert. She lives in a town 45 miles away. How long does it take until she gets the picture on her phone? Please, include the assumptions that you make.

Given:

distance of observer from the sound source,

distance between the source of image information sender and the receiver,

Assumptions:

speed of sound,

speed of the image information being sent, (we assume it to be nearly the speed of light in vacuum)

Solution:

Time taken by the sound to reach the observer:

Time taken by the image to reach the destination:

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.