A student runs down the hallway of the school at a speed of Vstudent = 4.1 m/s, carrying a ringing 1,101-Hz tuning fork toward a concrete wall. The wall reflects 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 66.4 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