A student runs down the hallway of the school at a speed of vstudent = 4.7 m/s, carrying a ringing 1,163-Hz tuning fork toward a concrete wall. The wall reects the sound. The speed of sound is V = 343 m/s. What is the beat frequency ( in Hz} heard by the student? Enter a number with one digit behind the decimal point. The decibel level of a sound is 54.1 dB. What is the intensity of the sound in nW/m?? 1 nW = 10-9 W Enter a number with 1 digit behind the decimal point