This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': '40 db compared to 20 db is - \nSelect and explain. \nA. Double, B. 10 times, C. 100 times, D. 1000 times', 'role': 'user'}, {'content': 'Answer: C \nExplanation: SPL = Sound pressure level\nIf a sound has an SPL of 1000 i.e (103) times, the reference of sound, it is expressed as\n20 × log 1000 = 20 × 3 = 60 dB (as log 1000 = 3)\nNow in the Q sound is 20 dB, that means to get 20 as the answer, 20 has to be multiplied by 1, i.e the SPL of this sound is 10 (because\nlog 10 is 1).\nNow it is being compared with 40 dB\nTo get 40 dB as the answer.\n20 has to be multiplied by 2 which means log of x = 2, therefore x = 100\nSo it means this sound should have SPL = 100\nNow see = 20 dB = SPL 10\n40 dB = SPL 100\ni.e. 40 dB is 10 times of 20 dB', 'role': 'assistant'}]