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a form of energy that gives us the sensation of hearing is called answer is sound the minimum required frequency for an audible sound is answer is 20 Hertz which of the following instruments is used to measure the intensity of sound answer is audio meter which of the following instruments converts electrical signals into sound answer is speaker the maximum audible frequency of sound is answer is 20 kilo Hertz in which of the following mediums will sound travel the fastest answer is iron the branch of physics that deals with the study of sound is called answer is acoustics in which of the following mediums sound cannot travel answer is vacuum the sound that reflects back after hitting a surface is called answer is echo which of the following properties of sound waves do not change when sound waves pass through one medium to another answer is frequency which of the following units is used to measure the intensity of a sound wave answer is decibel a form of