Who is considered the inventor of the microphone?

(A) Stephen Hawking

(B) Galileo

(C) Graham Bell

(D) None of these

Physics (8th) by John D. Cutnell, Kenneth... : Chapter 16, Problem42

As the drawing shows, one microphone is located at the origin, anda second microphone is located on the +y axis. The microphones areseparated by a distance of D = 1.37 m. A source of sound is locatedon the +x axis, its distances from microphones 1 and 2 being L1 andL2, respectively. The speed of sound is 344 m/s. The sound reachesmicrophone 1 first, and then, 1.27 ms later, it reaches microphone2. Find the distances (in m) (a) L1 and (b) L2.

A microphoneis attached to a spring that is suspended from theceiling. Directlybelow on the floor is a stationary 440 Hzsource of sound. Themicrophone oscillates up and down insimple harmonic motion with aperiod of 2.0s. The differencebetween the maximum and minimum soundfrequencies detected bythe microphone is 2.1 Hz.

What is themaximum speed of the microphone? What is the minimumspeed?