This 'age old' question, Ismail, was asked in a time that scientists did not know much of physics, and certainly didn’t have the equipment to measure sine waves or understand them. A tree falling would create a large and low wave, which would be audible to all the species who were around to witness it, whether they be human or not. Every physical action creates a sine wave, some larger than others. If you come across a tree and it is fallen, you will see the debris around it, you will see the end result of its fall, so why would the other physical reactions (such as creating a sine wave that can be 'heard' by human ears) not have taken place?Ī sine wave is a series of vibrations that can be picked up on depending on which frequencies a species can hear, for instance dolphins and whales can hear higher frequencies than humans, also dogs. There need be no witness to ensure that they are followed. The answer is that OF COURSE if a tree falls and no one was there to witness it the laws of physics are still enforced. The only thing that this question truly insinuates is if a physical reaction is triggered, and no one is there to witness it, are the other “dominosâ€� (physical reactions) triggered.
