Can you help me to answer?

3. For the following questions, you may use any resources you wish to answer them. You must write your solutions by hand, cite all your references, and show all your calculations. [a] A sound of Y decibels has how much intensity in watts per square meter? Is that enough to damage your hearing? [b] Watch the video youtube.com/watch?v=i_ODXxNeaQ0 (Vi Hart - What is up with noises). Write down and describe at least three concepts or ideas about that you found interesting in the video, and give the time stamps when they are first mentioned - at least one between 0:01 and 3:30 of the video, at least one between 3:31 and 7:00, and at least one between 7:01 and the end of the video. Your answer should total about 30-50 words. [c] Do the same as in [a] above for the video youtube.com/watch?v=ABjRnSYw-4k (Physics Girl - I built an acoustic levitator). [d] Do the same as in [a] above for the video youtube.com/watch?v=-65FMJTKGLs (Physics Girl - Can you guess this note? Perfect Pitch and Physics)