Jack's hearing test revealed that he needed a sound level of 20 dB to detect sounds at 2000 HZ. Sam's hearing test revealed that he needed a sound level of 40 dB to detect sounds at the same frequency If the normal sound level for testing is 15 dB, how much greater than normal were the sound intensities Jack and Sam needed to detect the sound?
plz explain, i don't mind if u give me the answer or not, i just want to understand how to do it , ty!!