My point about Mrs Stipp was in illustration of the fact that not hearing something does not necessarily indicate that it did not occur. I am not suggesting what may have gone on in the same way that Mr and Mrs N not hearing something does not necessarily indicate it did not happen.
You analysis of loudness is flawed. You are correct about loudness increasing with increasing dB and loudness increases with sound energy. But loudness is perceived sound energy, it is subjective and loudness is not directly proportional to sound energy however you measure it. So twice the sound pressure (+10dB) does not sound twice as loud. I'm afraid you've been googling the wrong sources.
Agreed. Not hearing something does not mean it didn't occur. But if it's reasonable to assume that a person with fully functioning ears would hear something, then the fact that they didn't is telling.
If someone told me that a helicopter had taken off from my front garden this morning while I was sitting drinking my coffee, I would disbelieve them. I have good, normal hearing, and I should have heard that. If they demonstrated with video that it had happened and I just hadn't heard it, I'd go and see an audiologist.
Likewise, Mr & Mrs Mike were up and listening for more sounds having been disturbed by a bat smacking a door but then managed to miss considerably louder gunshots...all four of them. They should have heard gunshots, that fact that they didn't either means that their hearing is defective or the gunshots didn't happen. Logically, it is considerably more likely to be the latter.
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0db is the quietest sound we can hear. Close to silence.
30db (a person speaking quietly) is about 1000 louder than 0db.
A jet engine taking off is 1,000,000,000,000 louder than the smallest sound we can detect.
And you don't believe that the sound of a jet engine taking off is 1000 louder than a hoover?
"Sound" is defined as vibrations moving through the air (or whatever medium) that can be heard when they get to our ears.
Decibels are used to measure (amongst other things) sound. Sound only applies to what our ears perceive, so they are a way of determining how loud a sound seems to us.
Yes, hearing is subjective - but not as subjective as you'd like. There are not many people with functioning ears that would miss hearing a jet engine take off.
But this is a very silly conversation. Surely you know that the sound of a bat on wood is considerably quieter than a gunshot? Nobody would go deaf listening to repeated smacks from a cricket bat....everyone would if they were subjected to gunshots over and over again.
This is because a gunshot is much, much LOUDER! And you seem to be trying to argue that it isn't!
Of course, sound energy drops away as it travels....but Mr and Mrs Mike didn't move and neither did the source of both sounds.
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Bottom line - gunshots = much, much louder than wood on wood smacks. And that's all we need to know for this discussion.