The sound of a man shouting at the top of his lungs from a rather large distance away from your ear has loudness of only 20 deci
bels. What would be the decibel level of four men shouting at the top of their (equally powerful) lungs from the same distance away from your ear? Assume that there is no interference from superposed waves and round off your answer to the nearest integer. 1. 160 dB 2. 80 dB 3. 60 dB 4. 10 dB 5. 14 dB 6. 6 dB 7. 20 dB 8. 40 dB
For infant and child resuscitation, current basic life support guidelines recommend a compression depth of one third to one half of the anteroposterior chest diameter
